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FORM 10-Q


SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D. C. 20549

(Mark One)

(X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2004

OR

( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the transition period from _________________ to _______________

Commission file number 0-16494

Southwest Royalties Institutional Income Fund VIII-B, L.P.
(Exact name of registrant as specified
in its limited partnership agreement)

Delaware 75-2220418
(State or other jurisdiction of (I.R.S.
Employer
incorporation or organization)
Identification No.)

6 Desta Drive, Suite 6500
Midland, Texas 79705
(Address of principal executive offices)

432-682-6324
(Registrant's telephone number,
including area code)

Indicate by check mark whether registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days:

Yes X No ___

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2). Yes No X

The registrant's outstanding securities consist of Units of limited
partnership interests for which there exists no established public market
from which to base a calculation of aggregate market value.

The total number of pages contained in this report is 23.


Glossary of Oil and Gas Terms
The following are abbreviations and definitions of terms commonly used in
the oil and gas industry that are used in this filing. All volumes of
natural gas referred to herein are stated at the legal pressure base to the
state or area where the reserves exit and at 60 degrees Fahrenheit and in
most instances are rounded to the nearest major multiple.

Bbl. One stock tank barrel, or 42 United States gallons liquid volume.

Developmental well. A well drilled within the proved area of an oil or
natural gas reservoir to the depth of a stratigraphic horizon known to be
productive.

Exploratory well. A well drilled to find and produce oil or gas in an
unproved area to find a new reservoir in a field previously found to be
productive of oil or natural gas in another reservoir or to extend a known
reservoir.

Farm-out arrangement. An agreement whereby the owner of the leasehold
or working interest agrees to assign his interest in certain specific
acreage to the assignee, retaining some interest, such as an overriding
royalty interest, subject to the drilling of one (1) or more wells or other
performance by the assignee.

Field. An area consisting of a single reservoir or multiple reservoirs
all grouped on or related to the same individual geological structural
feature and/or stratigraphic condition.

Mcf. One thousand cubic feet.

Net Profits Interest. An agreement whereby the owner receives a
specified percentage of the defined net profits from a producing property
in exchange for consideration paid. The net profits interest owner will
not otherwise participate in additional costs and expenses of the property.

Oil. Crude oil, condensate and natural gas liquids.

Overriding royalty interest. Interests that are carved out of a
working interest, and their duration is limited by the term of the lease
under which they are created.

Present value and PV-10 Value. When used with respect to oil and
natural gas reserves, the estimated future net revenue to be generated from
the production of proved reserves, determined in all material respects in
accordance with the rules and regulations of the SEC (generally using
prices and costs in effect as of the date indicated) without giving effect
to non-property related expenses such as general and administrative
expenses, debt service and future income tax expenses or to depreciation,
depletion and amortization, discounted using an annual discount rate of
10%.

Production costs. Costs incurred to operate and maintain wells and
related equipment and facilities, including depreciation and applicable
operating costs of support equipment and facilities and other costs of
operating and maintaining those wells and related equipment and facilities.

Proved Area. The part of a property to which proved reserves have been
specifically attributed.

Proved developed oil and gas reserves. Proved developed oil and gas
reserves are reserves that can be expected to be recovered from existing
wells with existing equipment and operating methods.

Proved properties. Properties with proved reserves.

Proved reserves. The estimated quantities of crude oil, natural gas,
and natural gas liquids that geological and engineering data demonstrate
with reasonable certainty to be recoverable in future years from known
reservoirs under existing economic and operating conditions.

Proved undeveloped reserves. Proved undeveloped oil and gas reserves
are reserves that are expected to be recovered from new wells on undrilled
acreage, or from existing wells where a relatively major expenditure is
required for recompletion.

Reservoir. A porous and permeable underground formation containing a
natural accumulation of producible oil or gas that is confined by
impermeable rock or water barriers and is individual and separate from
other reservoirs.

Royalty interest. An interest in an oil and natural gas property
entitling the owner to a share of oil or natural gas production free of
costs of production.

Working interest. The operating interest that gives the owner the
right to drill, produce and conduct operating activities on the property
and a share of production.

Workover. Operations on a producing well to restore or increase
production.




PART I. - FINANCIAL INFORMATION

Item 1. Financial Statements

The unaudited condensed financial statements included herein have been
prepared by the Registrant (herein also referred to as the "Partnership")
in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Rule 10-01
of Regulation S-X. Accordingly, they do not include all of the information
and footnotes required by generally accepted accounting principles for
complete financial statements. In the opinion of management, all
adjustments necessary for a fair presentation have been included and are of
a normal recurring nature. The financial statements should be read in
conjunction with the audited financial statements and the notes thereto for
the year ended December 31, 2003, which are found in the Registrant's Form
10-K Report for 2003 filed with the Securities and Exchange Commission.
The December 31, 2003 balance sheet included herein has been taken from the
Registrant's 2003 Form 10-K Report. Operating results for the three and
nine-month periods ended September 30, 2004 are not necessarily indicative
of the results that may be expected for the full year.



Southwest Royalties Institutional Income Fund VIII-B, L.P.
Balance Sheets

Septembe December
r 30, 31,
2004 2003
------ ------
(unaudit
ed)
Assets
- ----------

Current assets:
Cash and cash equivalents $ 158,385 103,986
Receivable from Managing 191,442 113,799
General Partner
-------- --------
---- ----
Total current assets 349,827 217,785
-------- --------
---- ----
Oil and gas properties -
using the full-
cost method of accounting 4,071,01 4,071,01
3 3
Less accumulated
depreciation,
depletion and 3,734,38 3,722,67
amortization 9 7
-------- --------
---- ----
Net oil and gas 336,624 348,336
properties
-------- --------
---- ----
$ 686,451 566,121
======= =======
Liabilities and Partners'
Equity
- ----------------------------
- ------------

Current liability - $ 372 224
distributions payable
-------- --------
---- ----

Asset retirement obligation 169,545 159,948
-------- --------
---- ----
Partners' equity:
General partner 13,585 1,355
Limited partners 502,949 404,594
-------- --------
---- ----
Total partners' equity 516,534 405,949
-------- --------
---- ----
$ 686,451 566,121
======= =======


Southwest Royalties Institutional Income Fund VIII-B, L.P.
Statements of Operations
(unaudited)

Three Months Ended Nine Months Ended
September 30, September 30,
2004 2003 2004 2003
----- ----- ----- -----
Revenues
- -------------
Income from net profits $ 236,991 182,815 749,144 577,002
interests
Interest 303 401 808 1,084
Other - 1 596 -
-------- -------- -------- --------
-- -- -- --
237,294 183,217 750,548 578,086
-------- -------- -------- --------
-- -- -- --
Expenses
- ------------
General and administrative 22,373 21,634 68,654 68,316
Depreciation, depletion and 3,712 5,000 11,712 18,600
amortization
Accretion of asset retirement 3,199 2,962 9,597 10,403
obligation
-------- -------- -------- --------
-- -- -- --
29,284 29,596 89,963 97,319
-------- -------- -------- --------
-- -- -- --
Net income from continuing 208,010 153,621 660,585 480,767
operations

Results from discontinued
operations -
sale of oil and gas leases - - 61 - 11,801
See Note 4
-------- -------- -------- --------
-- -- -- --
Net income before cumulative 208,010 153,682 660,585 492,568
effect

Cumulative effect of change in
accounting
principle - SFAS No. 143 - - - - (84,885)
See Note 3
-------- -------- -------- --------
-- -- -- --
Net income $ 208,010 153,682 660,585 407,683
====== ====== ====== ======
Net income allocated to:
Managing General Partner $ 21,172 15,868 67,230 42,668
====== ====== ====== ======
Limited Partners $ 186,838 137,814 593,355 365,015
====== ====== ====== ======
Per limited partner unit
before discontinued
operations and cumulative $ 18.41
effect 13.57 58.48 42.45
Discontinued operations per - .01 -
limited partner unit 1.05
Cumulative effects per - - - (7.53)
limited partner unit
-------- -------- -------- --------
-- -- -- --
Per limited partner unit $ 18.41
13.58 58.48 35.97
====== ====== ====== ======

Southwest Royalties Institutional Income Fund VIII-B, L.P.
Statements of Cash Flows
(unaudited)

Nine Month Ended
September 30,
2004 2003
----- -----
Cash flows from operating
activities
Cash received from income from
net
profits interests $ 647,947 563,667
Net cash received from - 12,201
discontinued operations
Cash paid to suppliers (45,100 (37,377
) )
Interest received 808 1,084
Other 596 -
------- -------
--- ---
Net cash provided by operating 604,251 539,575
activities
------- -------
--- ---
Cash flows from investing
activities
Sale of oil and gas properties - 63,787
------- -------
--- ---
Cash flows used in financing
activities
Distributions to partners (549,85 (519,03
2) 7)
------- -------
--- ---
Net increase in cash and cash 54,399 84,325
equivalents

Beginning of period 103,986 79,078
------- -------
--- ---
End of period $ 158,385 163,403
====== ======
Reconciliation of net income to
net cash
provided by operating
activities

Net income $ 660,585 407,683

Adjustments to reconcile net
income to net
cash provided by operating
activities
Depreciation, depletion and 11,712 18,600
amortization
Accretion of asset retirement 9,597 10,403
obligation
Cumulative effect of change in
accounting
principle - SFAS No. 143 - 84,885
Increase in receivables (101,19 (13,335
7) )
Increase in payables 23,554 31,339
------- -------
--- ---
Net cash provided by operating $ 604,251 539,575
activities
====== ======
Noncash investing and financing
activities:

Increase in oil and gas
properties - Adoption
of SFAS No. 143 $ - 139,086
====== ======
Decrease in oil and gas
properties - SFAS No. 143
sale of property $ - 77,435
====== ======
Increase in oil and gas
properties - SFAS No. 143
Addition of well due to $ - 47
farmout arrangement
====== ======
Southwest Royalties Institutional Income Fund VIII-B, L.P.
(a Delaware limited partnership)

Notes to Financial Statements

1. Organization
Southwest Royalties Institutional Income Fund VIII-B, L.P. was
organized under the laws of the state of Delaware on November 30,
1987, for the purpose of acquiring producing oil and gas properties
and to produce and market crude oil and natural gas produced from such
properties for a term of 50 years, unless terminated at an earlier
date as provided for in the Partnership Agreement. The offering of
limited partner units began March 31, 1988, minimum capital
requirements were met July 11, 1988, with the offering concluded on
March 31, 1989. The Partnership sells its oil and gas production to a
variety of purchasers with the prices it receives being dependent upon
the oil and gas economy. Southwest Royalties, Inc. a wholly owned
subsidiary of Clayton Williams Energy, Inc., serves as the Managing
General Partner. Revenues, costs and expenses are allocated as
follows:
Limited General
Partners Partners
-------- --------
Interest income on capital 100% -
contributions
Oil and gas sales from net 90% 10%
profits interests
All other revenues 90% 10%
Organization and offering 100% -
costs (1)
Amortization of organization 100% -
costs
Property acquisition costs 100% -
Gain/loss on property 90% 10%
dispositions
Operating and administrative 90% 10%
costs (2)
Depreciation, depletion and
amortization
of oil and gas properties 100% -
All other costs 90% 10%

(1) All organization costs in excess of 3% of initial capital
contributions will be paid by the Managing General Partner and
will be treated as a capital contribution. The Partnership paid
the Managing General Partner an amount equal to 3% of initial
capital contributions for such organization costs.

(2) Administrative costs in any year which exceed 2% of capital
contributions shall be paid by the Managing Partner and will be
treated as a capital contribution.

2. Summary of Significant Accounting Policies
The interim financial information as of September 30, 2004, and for
the three and nine months ended September 30, 2004, is unaudited.
Certain information and footnote disclosures normally included in
financial statements prepared in accordance with generally accepted
accounting principles have been condensed or omitted in this Form 10-Q
pursuant to the rules and regulations of the Securities and Exchange
Commission. However, in the opinion of management, these interim
financial statements include all the necessary adjustments to fairly
present the results of the interim periods and all such adjustments
are of a normal recurring nature. The interim consolidated financial
statements should be read in conjunction with the Partnership's Annual
Report on Form 10-K for the year ended December 31, 2003.

Southwest Royalties Institutional Income Fund VIII-B, L.P.
(a Delaware limited partnership)

Notes to Financial Statements

3. Cumulative effect of change in accounting principle - SFAS No. 143
On January 1, 2003, the Partnership adopted Statement of Financial
Accounting Standards No. 143, Accounting for Asset Retirement
Obligations ("SFAS No. 143"). Adoption of SFAS No. 143 is required
for all companies with fiscal years beginning after June 15, 2002.
The new standard requires the Partnership to recognize a liability for
the present value of all legal obligations associated with the
retirement of tangible long-lived assets and to capitalize an equal
amount as a cost of the asset and depreciate the additional cost over
the estimated useful life of the asset. On January 1, 2003, the
Partnership recorded additional costs, net of accumulated
depreciation, of approximately $139,086, a long term liability of
approximately $223,971 and a loss of approximately $84,885 for the
cumulative effect on depreciation of the additional costs and
accretion expense on the liability related to expected abandonment
costs of its oil and natural gas producing properties. At September
30, 2004, the asset retirement obligation was $169,545. The increase
in the balance from January 1, 2004 is due to accretion expense of
$9,597.

4. Discontinued Operations - Sale of oil and gas leases
During the three months ended June 30, 2003, the Partnership sold its
interest in certain oil, gas and salt water disposal wells for $63,787
sales proceeds and retired $77,435 of asset retirement obligation
associated with the properties. Since the Partnership is under the
full cost pool method of accounting, the sales proceeds and asset
retirement obligation liability were taken against the oil and gas
properties asset account and therefore, no gain or loss was recorded
and shown on the statement of operations as part of the discontinued
operations. Pursuant to the requirements of SFAS No. 144, the
historical operating results from these properties have been reported
as discontinued operations in the accompanying statements of
operations. The following table summarizes certain historical
operating information related to the discontinued operations:

Three Nine
months months
ended ended
September 30, 2003

Income from net profit $ $
interest 61 11,801

5. Change in Control of Managing General Partner
On May 21, 2004, Clayton Williams Energy, Inc. acquired all the
outstanding common stock of Southwest Royalties Inc. through a merger.
Clayton Williams Energy, Inc. paid $57.1 million to holders of
Southwest Royalties, Inc. common stock and common stock warrants
($45.01 per share) and assumed and refinanced approximately
$113.9 million of assumed bank debt at closing.


Item 2. Management's Discussion and Analysis of Financial Condition and
Results of Operations

General
Southwest Royalties Institutional Income Fund VIII-B, L.P. was organized as
a Delaware limited partnership on November 30, 1987. The offering of such
limited partnership interests began March 31, 1988, minimum capital
requirements were met July 11, 1988, and concluded on March 31, 1989 with
total limited partner contributions of $5,073,500.

The Partnership was formed to acquire royalty and net profits interests in
producing oil and gas properties, to produce and market crude oil and
natural gas produced from such properties, and to distribute the net
proceeds from operations to the limited and general partners. Net revenues
from producing oil and gas properties will not be reinvested in other
revenue producing assets except to the extent that production facilities
and wells are improved or reworked or where methods are employed to improve
or enable more efficient recovery of oil and gas reserves. The economic
life of the Partnership thus depends on the period over which the
Partnership's oil and gas reserves are economically recoverable.

Increases or decreases in Partnership revenues and, therefore,
distributions to partners will depend primarily on changes in the prices
received for production, changes in volumes of production sold, lease
operating expenses, enhanced recovery projects, offset drilling activities
pursuant to farmout arrangements, sales of properties, and the depletion of
wells. Since wells deplete over time, production can generally be expected
to decline from year to year.

Well operating costs and general and administrative costs usually decrease
with production declines; however, these costs may not decrease
proportionately. Net income available for distribution to the partners is
therefore expected to fluctuate in later years based on these factors.

Oil and Gas Properties

Oil and gas properties are accounted for at cost under the full-cost
method. Under this method, all productive and nonproductive costs incurred
in connection with the acquisition, exploration and development of oil and
gas reserves are capitalized. Gain or loss on the sale of oil and gas
properties is not recognized unless significant oil and gas reserves are
sold.

Should the net capitalized costs exceed the estimated present value of oil
and gas reserves, discounted at 10%, such excess costs would be charged to
current expense. As of September 30, 2004, the net capitalized costs did
not exceed the estimated present value of oil and gas reserves.


The Partnership's interest in oil and gas properties consists of net
profits interests in proved properties located within the continental
United States. A net profits interest is created when the owner of a
working interest in a property enters into an arrangement providing that
the net profits interest owner will receive a stated percentage of the net
profit from the property. The net profits interest owner will not
otherwise participate in additional costs and expenses of the property.

The Partnership recognizes income from its net profits interest in oil and
gas property on an accrual basis, while the quarterly cash distributions of
the net profits interest are based on a calculation of actual cash received
from oil and gas sales, net of expenses incurred during that quarterly
period. If the net profits interest calculation results in expenses
incurred exceeding the oil and gas income received during a quarter, no
cash distribution is due to the Partnership's net profits interest until
the deficit is recovered from future net profits. The Partnership accrues
a quarterly loss on its net profits interest provided there is a cumulative
net amount due for accrued revenue as of the balance sheet date. As of
September 30, 2004, there were no timing differences, which resulted in a
deficit net profit interest.

Critical Accounting Policies

The Partnership follows the full cost method of accounting for its oil and
gas properties. The full cost method subjects companies to quarterly
calculations of a "ceiling", or limitation on the amount of properties that
can be capitalized on the balance sheet. If the Partnership's capitalized
costs are in excess of the calculated ceiling, the excess must be written
off as an expense.

The Partnership's discounted present value of its proved oil and natural
gas reserves is a major component of the ceiling calculation, and
represents the component that requires the most subjective judgments.
Estimates of reserves are forecasts based on engineering data, projected
future rates of production and the timing of future expenditures. The
process of estimating oil and natural gas reserves requires substantial
judgment, resulting in imprecise determinations, particularly for new
discoveries. Different reserve engineers may make different estimates of
reserve quantities based on the same data. The Partnership's reserve
estimates are prepared by outside consultants. Quarterly reserve estimates
are prepared by the Managing General Partner's internal staff of engineers.

The passage of time provides more qualitative information regarding
estimates of reserves, and revisions are made to prior estimates to reflect
updated information. However, there can be no assurance that more
significant revisions will not be necessary in the future. If future
significant revisions are necessary that reduce previously estimated
reserve quantities, it could result in a full cost property writedown. In
addition to the impact of these estimates of proved reserves on calculation
of the ceiling, estimates of proved reserves are also a significant
component of the calculation of DD&A.

While the quantities of proved reserves require substantial judgment, the
associated prices of oil and natural gas reserves that are included in the
discounted present value of the reserves do not require judgment. The
ceiling calculation dictates that prices and costs in effect as of the last
day of the period are generally held constant indefinitely. Because the
ceiling calculation dictates that prices in effect as of the last day of
the applicable quarter are held constant indefinitely, the resulting value
is not indicative of the true fair value of the reserves. Oil and natural
gas prices have historically been cyclical and, on any particular day at
the end of a quarter, can be either substantially higher or lower than the
Partnership's long-term price forecast that is a barometer for true fair
value.

Results of Operations

A. General Comparison of the Quarters Ended September 30, 2004 and 2003

The following table provides certain information regarding performance
factors for the quarters ended September 30, 2004 and 2003:

Three Months
Ended Percenta
ge
September 30, Increase
2004 2003 (Decreas
e)
----- ----- --------
--
Average price per barrel of $ 41.88 43%
oil 29.23
Average price per mcf of gas $ 5.65 22%
4.63
Oil production in barrels 8,778 9,500 (8%)
Gas production in mcf 8,131 8,600 (5%)
Income from net profits $ 236,991 182,815 30%
interests
Partnership distributions $ 200,000 213,718 (6%)
Limited partner $ 180,000 193,718 (7%)
distributions
Per unit distribution to
limited
partners $ 17.74 (7%)
19.09
Number of limited partner 10,147 10,147
units

Revenues

The Partnership's income from net profits interests increased to $236,991
from $182,815 for the quarters ended September 30, 2004 and 2003,
respectively, an increase of 30%. The principal factors affecting the
comparison of the quarters ended September 30, 2004 and 2003 are as
follows:

1. The average price for a barrel of oil received by the Partnership
increased during the quarter ended September 30, 2004 as compared to
the quarter ended September 30, 2003 by 43%, or $12.66 per barrel,
resulting in an increase of approximately $111,100 in income from net
profits interests. Oil sales represented 89% of total oil and gas
sales during the quarter ended September 30, 2004 as compared to 87%
during the quarter ended September 30, 2003.

The average price for an mcf of gas received by the Partnership
increased during the same period by 22%, or $1.02 per mcf, resulting
in an increase of approximately $8,300 in income from net profits
interests.

The total increase in income from net profits interests due to the
change in prices received from oil and gas production is approximately
$119,400. The market price for oil and gas has been extremely
volatile over the past decade, and management expects a certain amount
of volatility to continue in the foreseeable future.


2. Oil production decreased approximately 722 barrels or 8% during the
quarter ended September 30, 2004 as compared to the quarter ended
September 30, 2003, resulting in a decrease of approximately $21,100 in
income from net profits interests.

Gas production decreased approximately 469 mcf or 5% during the same
period, resulting in a decrease of approximately $2,200 in income from
net profits interests.

The total decrease in income from net profits interests due to the
change in production is approximately $23,300.

3. Lease operating costs and production taxes were 31% higher, or
approximately $41,900 more during the quarter ended September 30, 2004
as compared to the quarter ended September 30, 2003. The increase in
lease operating costs is due to surface repairs and well work on one
property and surface repairs on another property. An increase in
production taxes is the result of higher oil and gas prices.

Costs and Expenses

Total costs and expenses decreased to $29,284 from $29,596 for the quarters
ended September 30, 2004 and 2003, respectively, a decrease of 1%. The
decrease is the result of lower depletion expense, partially offset by an
increase in general and administrative expense and accretion expense.

1. General and administrative costs consists of independent accounting and
engineering fees, computer services, postage, and Managing General
Partner personnel costs. General and administrative costs increased 3%
or approximately $700 during the quarter ended September 30, 2004 as
compared to the quarter ended September 30, 2003.

2. Depletion expense decreased to $3,712 for the quarter ended September
30, 2004 from $5,000 for the same period in 2003. This represents a
decrease of 26%. The contributing factor to the decrease in depletion
expense is in relation to the BOE depletion rate for the quarter ended
September 30, 2004, which was $.37 applied to 10,133 BOE as compared to
$.46 applied to 10,933 BOE for the same period in 2003. The lower
depreciation rate in 2004 is due to the upward revision in reserve
estimates resulting from higher oil and gas prices.

3. Accretion expense increased to $3,199 for the quarter ended September
30, 2004 from $2,962 for the same period in 2003. This represents an
increase of 8%.


B. General Comparison of the Nine-Month Periods Ended September 30, 2004
and 2003

The following table provides certain information regarding performance
factors for the nine-month periods ended September 30, 2004 and 2003:

Nine Months
Ended Percenta
ge
September 30, Increase
2004 2003 (Decreas
e)
----- ----- --------
--
Average price per barrel of $ 38.19 29%
oil 29.71
Average price per mcf of gas $ 5.61 9%
5.13
Oil production in barrels 27,128 28,963 (6%)
Gas production in mcf 25,881 26,500 (2%)
Income from net profits $ 749,144 577,002 30%
interests
Partnership distributions $ 550,000 518,718 6%
Limited partner $ 495,000 468,218 6%
distributions
Per unit distribution to
limited
partners $ 48.78 6%
46.14
Number of limited partner 10,147 10,147
units

Revenues

The Partnership's income from net profits interests increased to $749,144
from $577,002 for the nine months ended September 30, 2004 and 2003,
respectively, an increase of 30%. The principal factors affecting the
comparison of the nine months ended September 30, 2004 and 2003 are as
follows:

1. The average price for a barrel of oil received by the Partnership
increased during the nine months ended September 30, 2004 as compared
to the nine months ended September 30, 2003 by 29%, or $8.48 per
barrel, resulting in an increase of approximately $230,000 in income
from net profits interests. Oil sales represented 88% of total oil and
gas sales during the nine months ended September 30, 2004 as compared
to 86% during the nine months ended September 30, 2003.

The average price for an mcf of gas received by the Partnership
increased during the same period by 9%, or $.48 per mcf, resulting in
an increase of approximately $12,500 in income from net profits
interests.

The total increase in income from net profits interests due to the
change in prices received from oil and gas production is approximately
$242,500. The market price for oil and gas has been extremely volatile
over the past decade, and management expects a certain amount of
volatility to continue in the foreseeable future.


2. Oil production decreased approximately 1,835 barrels or 6% during the
nine months ended September 30, 2004 as compared to the nine months
ended September 30, 2003, resulting in a decrease of approximately
$54,500 in income from net profits interests.

Gas production decreased approximately 619 mcf or 2% during the same
period, resulting in a decrease of approximately $3,200 in income from
net profits interests.

The total decrease in income from net profits interests due to the
change in production is approximately $57,700.

3. Lease operating costs and production taxes were 3% higher, or
approximately $12,600 more during the nine months ended September 30,
2004 as compared to the nine months ended September 30, 2003.

Costs and Expenses

Total costs and expenses decreased to $89,963 from $97,319 for the nine
months ended September 30, 2004 and 2003, respectively, a decrease of 8%.
The decrease is the result of lower accretion expense and depletion
expense, partially offset by an increase in general and administrative
expense.

1. General and administrative costs consists of independent accounting and
engineering fees, computer services, postage, and Managing General
Partner personnel costs. General and administrative costs increased
less than 1% or approximately $300 during the nine months ended
September 30, 2004 as compared to the nine months ended September 30,
2003.

2. Depletion expense decreased to $11,712 for the nine months ended
September 30, 2004 from $18,600 for the same period in 2003. This
represents a decrease of 37%. The contributing factor to the decrease
in depletion expense is in relation to the BOE depletion rate for the
nine months ended September 30, 2004, which was $.37 applied to 31,442
BOE as compared to $.56 applied to 33,380 BOE for the same period in
2003. The lower depreciation rate in 2004 is due to the upward
revision in reserve estimates resulting from higher oil and gas prices.

3. Accretion expense decreased to $9,597 for the nine months ended
September 30, 2004 from $10,403 for the same period in 2004. This
represents a decrease of 8%.


Liquidity and Capital Resources

The primary source of cash is from operations, the receipt of income from
interests in oil and gas properties. The Partnership knows of no material
change, nor does it anticipate any such change.

Cash flows provided by operating activities were approximately $604,300 in
the nine months ended September 30, 2004 as compared to approximately
$539,600 in the nine months ended September 30, 2003.

There were no cash flows used in investing activities during the nine
months ended September 30, 2004. Cash flows provided by investing
activities were approximately $63,800 in the nine months ended September
30, 2003.

Cash flows used in financing activities were approximately $549,900 in the
nine months ended September 30, 2004 as compared to approximately $519,000
in the nine months ended September 30, 2003. The only use in financing
activities was the distributions to partners.

Total distributions during the nine months ended September 30, 2004 were
$550,000 of which $495,000 was distributed to the limited partners and
$55,000 to the general partners. The per unit distribution to limited
partners during the nine months ended September 30, 2004 was $48.78. Total
distributions during the nine months ended September 30, 2003 were $518,718
of which $468,218 was distributed to the limited partners and $50,500 to
the general partners. The per unit distribution to limited partners during
the nine months ended September 30, 2003 was $46.14.

The sources for the 2004 distributions of $550,000 were oil and gas
operations of approximately $604,300, resulting in excess cash for
contingencies or subsequent distributions. The source for the 2003
distributions of $518,718 was oil and gas operations of approximately
$539,600, the change in oil and gas property of approximately $63,800,
resulting in excess cash for contingencies or subsequent distributions.

Cumulative cash distributions of $8,457,287 have been made to the partners.
As of September 30, 2004, $7,633,521 or $752.29 per limited partner unit
has been distributed to the limited partners, representing a 100% return of
the capital and 50% return on capital contributed.

As of September 30, 2004, the Partnership had approximately $349,500 in
working capital. The Managing General Partner knows of no unusual
contractual commitments. The partnership held many long-lived properties
at inception, however due to the restrictions on property development
imposed by the partnership agreement, the Partnership cannot develop its
non producing properties. Without continued development, the producing
reserves continue to deplete. Accordingly, as the Partnership's properties
have matured and depleted, the net cash flows from operations for the
partnership has steadily declined, except in periods of substantially
increased commodity pricing. Maintenance of properties and administrative
expenses for the Partnership are increasing relative to production. As the
properties continue to deplete, maintenance of properties and
administrative costs as a percentage of production are expected to continue
to increase.

Managing General Partner

On May 21, 2004, Clayton Williams Energy, Inc. acquired all the outstanding
common stock of Southwest Royalties Inc. through a merger. Clayton
Williams Energy, Inc. paid $57.1 million to holders of Southwest Royalties,
Inc. common stock and common stock warrants ($45.01 per share) and assumed
and refinanced approximately $113.9 million of assumed bank debt at
closing.



Item 3. Quantitative and Qualitative Disclosures About Market Risk

The Partnership is not a party to any derivative or embedded derivative
instruments.

Item 4. Controls and Procedures

Disclosure Controls and Procedures
As of the nine months ended September 30, 2004, L. Paul Latham, President
and Chief Executive Officer of the Managing General Partner, and Mel G.
Riggs, Vice President and Chief Financial Officer of the Managing General
Partner, evaluated the effectiveness of the Partnership's disclosure
controls and procedures. Based on their evaluation, they believe that:

The disclosure controls and procedures of the Partnership were
effective in ensuring that information required to be disclosed by the
Partnership in the reports it files or submits under the Exchange Act
was recorded, processed, summarized and reported within the time
periods specified in the SEC's rules and forms; and

The disclosure controls and procedures of the Partnership were
effective in ensuring that material information required to be
disclosed by the Partnership in the report it filed or submitted under
the Exchange Act was accumulated and communicated to the Managing
General Partner's management, including its Chief Executive Officer
and Chief Financial Officer, as appropriate to allow timely decisions
regarding required disclosure.

Internal Control Over Financial Reporting
There has not been any change in the Partnership's internal control over
financial reporting that occurred during the nine months ended September
30, 2004 that has materially affected, or is reasonably likely to
materially affect, internal control over financial reporting.


PART II - OTHER INFORMATION


Item 1. Legal Proceedings

None

Item 2. Changes in Securities

None

Item 3. Defaults Upon Senior Securities

None

Item 4. Submission of Matter to a Vote of Security Holders

None

Item 5. Other Information

None

Item 6. Exhibits and Reports on Form 8-K

(a) Exhibits:

31.1 Rule 13a-14(a)/15d-14(a) Certification
31.2 Rule 13a-14(a)/15d-14(a) Certification
32.1 Certification of Chief Executive Officer Pursuant to
18 U.S.C. Section
1350, as
adopted Pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002
32.2 Certification of Chief Financial Officer Pursuant to
18 U.S.C. Section
1350, as
adopted Pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002

(b) No reports on Form 8-K were filed during the quarter for which
this report is filed.



SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

SOUTHWEST ROYALTIES INSTITUTIONAL
INCOME FUND VIII-B, L.P.
a Delaware limited partnership


By: Southwest Royalties, Inc.
Managing General Partner


By: /s/ Mel G. Riggs
Mel G. Riggs
Vice President and Chief Financial
Officer


Date: November 15, 2004

SECTION 302 CERTIFICATION Exhibit 31.1


I, L. Paul Latham, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Southwest
Royalties Institutional Income Fund VIII-B, L.P.

2.Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered
by this report;

3.Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and have:

a)Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;

b)Evaluated the effectiveness of the registrant's disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end
of the period covered by this report based on such evaluation; and

c)Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the registrant's
most recent fiscal quarter (the registrant's fourth fiscal quarter in
the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant's internal
control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based
on our most recent evaluation of internal control over financial
reporting, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent
functions):

a)All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which
reasonably likely to adversely affect the registrant's ability to
record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal
control over financial reporting.


Date: November 15, 2004 /s/ L. Paul Latham
L. Paul Latham
President and Chief Executive Officer
of Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional Income
Fund VIII-B, L.P.



SECTION 302 CERTIFICATION Exhibit 31.2


I, Mel G. Riggs, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Southwest
Royalties Institutional Income Fund VIII-B, L.P.

2.Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered
by this report;

3.Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and have:

a)Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;

b)Evaluated the effectiveness of the registrant's disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end
of the period covered by this report based on such evaluation; and

c)Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the registrant's
most recent fiscal quarter (the registrant's fourth fiscal quarter in
the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant's internal
control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based
on our most recent evaluation of internal control over financial
reporting, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent
functions):

a)All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which
reasonably likely to adversely affect the registrant's ability to
record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal
control over financial reporting.


Date: November 15, 2004 /s/ Mel G. Riggs
Mel G. Riggs
Vice President and Chief Financial
Officer of
Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional Income
Fund VIII-B, L.P.



CERTIFICATION PURSUANT TO
Exhibit 32.1
19 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the Quarterly Report of Southwest Royalties
Institutional Income Fund VIII-B, L. P. (the "Company") on Form 10-Q for
the period ending September 30, 2004 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, L. Paul Latham,
Chief Executive Officer of the Managing General Partner of the Company,
certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to 906 of the
Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results
of operation of the
Company.


Date: November 15, 2004




/s/ L. Paul Latham
L. Paul Latham
President and Chief Executive Officer
of Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional Income Fund VIII-B, L.P.

CERTIFICATION PURSUANT TO Exhibit 32.2
19 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the Quarterly Report of Southwest Royalties
Institutional Income Fund VIII-B, L. P. (the "Company") on Form 10-Q for
the period ending September 30, 2004 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Mel G. Riggs,
Chief Financial Officer of the Managing General Partner of the Company,
certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to 906 of the
Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results
of operation of the
Company.


Date: November 15, 2004




/s/ Mel G. Riggs
Mel G. Riggs
Vice President and Chief Financial Officer of
and Chief Financial Officer of
Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional Income Fund VIII-B, L.P.