How To Hotrod Your Buick V6 — High-Performance Tuning Manual

- HPBooks HnW TO HOTBOD YOUR 'i! t , 'j I ' b j 1 Details modifications to cylinder heads, blocks & cranksbh. How to prepare (li set up Make, ignition (B oiling systems. I Tdmkd &ta 81 bluiepri'ntingl details. Cornprehenskre Heawy-Duty Parts list. I

Go in style with Genuine Buick Sports- wear. The best materials and workmanship go Intothese exclusivedesigns. Most items feature the new logo symbolizing Bulck's V6 engine. ..the heart of Buick's high performance effort. This logo will be appearing on an increasing number of race cars: it says "Buick Powered:' And Buick cars are proving to be the ones to watch in more and more racing environments. Use the quick and easy order form today, to get the items of your choice. 1,2, V-neck Sweaters: Classic V-neck In soft orlon In 4, InsulatedJacket: Fully Insulatedcottonlpoly winter tan or navy. Direct embroldered loga 3, Light Uned weight wlth combination zippered security and Jacket: Finely detailed casualjacket In tan with navy hand warmer pockets. 5, leather Jacket: Supple, trim and lining, embroidered log? durable leather; miniature logo label. I 6, Golf Shirt: Navy, 4-button. 50150 cottonlpoly jersey. 7, Pblo:Color accent knit collar.white knit wlpocket. 4 Roclng Jacket: Tricolor, fully linedantronnylon with motorsports logo embroldered. 9, lndy T-Shlrt: 100% cotton heavyweight tee with ll, Navy Cap: Pirrwaie corduroywith Bulck logo direct Bulck Motorsportslogo on left chest and large lndy embroldered. l,Tan Cap: Tan polylcatton baseball graphic on rear. 10, Vintage T-shirt:Small Bulck logo caR adjustable 13, White Visor: Pbly/cotton vlsor wlth 4 on left chest and large vintage Buick rear. terrycloth lining, redlnavy logn 8. RacingJacket 1 9. indy T-shirt 7.95 10. Vintage T-shirt 7.95 I I 11. Baseballcap, Navy I 7.95 1 one size fitTail 12. Baseball Cap, Tan I 7.95 1 one size fits all 13. Visor, White 5.95 1 one size fits all I SEND TO: SUBTOTAL I I MOLLY DESIGNS, INC. California residentsadd 6% tax 23096 TERRA DRIVE Shipping and Handling TOTAL LAGUNA HILLS, CA 92653 . notavailable SIAW I XS I S I M I L I XL I XXL CHESl 1 30-32 1 34-36 1 38-40 1 42-44 1 46-48 1 50-52 NOTE: Please HI1 out order form completely, so that your order can be pmcessed as quickly as possible. Allow 3-4 weeks delivery. Satisfaction guaranteed: If you are dissatisfiedwith the workmanship or materials of your Bulck garment, return item posta e paid within ten (101 days for exchangeor refund.All garments subject?o availability. Refund will be made If exchange Is not possible. NAME n ADDRESS CIW STATE Zt P I 1 PHONE CHECK (payable to: Molly Designs, inc.] MONEY ORDER MASTERCARD VISA SEND NO CASH CREDIT CARD NUMBER EXPIRATION DATE (molyear] SIGNATURE (required If usingcredit card] CREDIT CARD TELEPHONE ORDERING. Pleasehave credit card and brochure on hand when calling. Only credit card orders can be accepted by telephone. Call 1-800-824-4505 toll free. In California call 1-714-768-7455. Go in style with Genuin e Buick Sports- wear. The best material s and workma n- ship go into these exclusive designs. Most items feature the new logo s ymbo li zing Buick's V6 engine .. . the heart of Bui ck's high performance effort. This logo will be appearing on an increasing number of race cars: it says "Buick Powered ." And Buick cars are proving to be the ones to watch in more and more racing environments. Use the quick and easy order form today , to get the items of your choice. 1,2, V-neck Sweaters: Class ic V-neck In soft o rl an in tan or navy. Di r ect embr oidered logo. 3, Light Lin ed Jacket: Finely deta il ed casual jacket in tan with navy trim and lining. embroidered logo. 4, Insulated Jacket: Fully insulated cotton/poly winter weight wi th combination zippered security and hand warmer pockets. 5, Leather Jacket: Supple, durab le leather; miniature logo label. 6, Golf Shirt : Navy. 4-butt on. 50/50 cotton/poly jer sey. 7, Po lo: Color accent knit c o llar . white kn it w/pocket. 8, Racing Jacket: Tr i-color. fully lined a ntron nylon wi th motorspo rt s l og o embr oide red. 9, Indy T- S hirt: 100% cotton heavyweight tee with Bui ck Motorsports l ogo on left chest and large Indy graph ic on rear. 10, Vintage T- Shi rt: Small Buick l ogo on left chest and large vintage B ui ck rear. n, Navy Cap: Pi nwale cordur oy wi th Buick logo direct embroidered. 12, Tan Cap: Tan poly/cotton baseball cap, adjustable 13, Whi te Visor: Poly/cotton visor wi th te rryc l oth li ning, red/navy logo. TOTAL TOTAL f-=,..:;:.:::;:-r.7T-::"';-::~r:7.~ QUANT ITY COST ~--~--~~------1-~~~ SEND TO : MOLLY DESIGNS, INC. 23096 TERRA DRIVE LAGUNA HILLS, CA 92653 S UBTOTAL 1--------1 Cal iforn ia residents add 6% ta x f--- -j Shippi ng and Handling f--'---'-'--j TOTAL • not available NOTE: Please fill out order form co mplete ly, so tha t your order can be processed as q uickly as possible Allow 3-4 weeks delivery. Satisfaction guaranteed : If you are di ss atisfied with th e wor kmanship or materials of your Buick garment, return item postage pa id wit hin ten (10) days for exch a nge or refund . All gar ments su b ject to availability. Refund will be made if exchange is not possible. NAME ADDR ESS CITY ( ) PHONE S TATE ZIP o CH ECK (payab le to: Molly Designs, Inc .) o MONEY ORDER o MASTERCARD o VISA SEND NO CASH C REDIT CARD NUMBER EXPIRATION DATE (mo/year) SI GNATURE (required if using credi t c ard) C REDIT CARD TELEPHONE ORDERING: Please have credit card and brochure on hand when calli ng. Only credit c ard orders can be accepted by telep hone . Ca ll 1-800-824-4505 toll free . In California ca ll 1-714-768-7155.

HPBooks @ HOW TO HOTROD YOUR Look for the Buick V6 logo to take on increasing significance with performance engine builders. This "arrow" is on target because it symbolizes today's performance engine . . , tbe Buick V6 Publisher: Rick Bailey; Executive Editor: Randy Summerlin Editorial Director: Tom Monroe, P.E., S.A.E. Senior Editor: Ron Sessions, A.S.A.E.;Art Director: Don Burton Production Coordinator: Cindy J. Coatsworth Director of Manufacturing: Anthony B. Narducci Published by HPBooks A Division of HPBooks, Inc. P.O. Box 5367, Tucson, AZ 85703 6021888-2150 ISBN 0-89586-514-9 Library of Congress Catalog Number 86-45964 0 1986 HPBooks, Inc. Printed in U.S.A. 1st Printing NOTICE: The information contained in this book is true and complete to the best of our knowledge. AU recommendationson parts and procedures are made without any guarantees on the part of Buick Motor Division or HPBooks. Because the procedures and methods are beyond our control, Buick and publisher disclaim all liability incurred in connection with the use of this information. Buick Power Source I HPBooks® HOW TO HOTROD YOUR Look for the Buick V6 logo to take on increasing significance with performance engine builders. This \\arrow" is on target because it symbolizes today's performance engine ... the Buick V6. Publisher: Rick Bailey; Executive Editor: Randy Summerlin Editorial Director: Tom Monroe, P.E., S.A.E. Senior Editor: Ron Sessions, A.S.A.E.; Art Director: Don Burton Production Coordinator: Cindy J. Coatsworth Director of Manufacturing: Anthony B. Narducci Published by HPBooks A Division of HPBooks, Inc. P.O. Box 5367, Tucson, AZ 85703 602/888-2150 ISBN 0-89586-514-9 Library of Congress Catalog Number 86-45964 ©1986 HPBooks, Inc. Printed in U.S.A. 1st Printing NOTICE: The information contained in this book is true and complete to the best of our knowledge. All recommendations on parts and procedures are made without any guarantees on the part of Buick Motor Division or HPBooks. Because the procedures and methods are beyond our control, Buick and publisher disclaim all liability incurred in connection with the use of this information. Buick Power Source 1

Introduction ..................... I Building a High- Performance V6 .............. 4 Competitive Combinations USAC Turbocharged Indy Trans Am Normally Aspirated Drag Race Turbocharged Drag Race Turbocharged Road Race Normally Aspirated Circle Track (NASCAR Sportsman) .. .r 2;. ,,:". TI, . , .... , ,a,;,. ,+,,a ,. W-i.. .... . Buick Power Source ............. Cylinder Blocks 42 Heavy-Duty Blocks Preparation Preparation Checklist Cleaning Assembly .............. Cylinder Heads 54 Production and Stage I Heads Production and Stage I Cylinder Head Porting Stage I1 Iron Heads Stage I1 Aluminum Heads Stage I1 Cylinder Head Porting Valve Seat Modifications Cylinder Head Studs Rocker Covers Head Gaskets ................... Crankshaft .. 70 Raw Forged Crankshafts Semifinished Crankshafts Crank Checking Balancing ..................... .. 82 Counterweighting ........................ Bearings.. 84 Modi'fying V8 Crank Bearings for V6s Heavy-Duty Cam Bearings Flywheel and .... Torsional Dampener 86 Flexplates Bellhousing Alignment Torsional Dampener Connecting Rods ........... 90 Aftermarket Steel and Aluminum Rods Introduction ..................... l Building a High- Performance V6 .............. 4 Competitive Combinations USAC Turbocharged Indy Trans Am Normally Aspirated Drag Race Turbocharged Drag Race Turbocharged Road Race Normally Aspirated Circle Track (N ASCAR Sportsman) 2 Buick Power Source Cylinder Blocks ............. 42 Heavy-Duty Blocks Preparation Preparation Checklist Cleaning Assembly Cylinder Heads .............. 54 Production and Stage I Heads Production and Stage I Cylinder Head Porting Stage II Iron Heads Stage II Aluminum Heads Stage II Cylinder Head Porting Valve Seat Modifications Cylinder Head Studs Rocker Covers Head Gaskets Crankshaft ..................... 70 Raw Forged Crankshafts Semifinished Crankshafts Crank Checking Balancing ....................... 82 Counterweighting Bearings .......................... 84 Modifying V8 Crank Bearings for V6s Heavy-Duty Cam Bearings Flywheel and Torsional Dampener .... 86 Flexplates Bellhousing Alignment Torsional Dampener Connecting Rods .. ....... .. 90 Aftermarket Steel and Aluminum Rods

Pistons ............................. 94 Buick Heavy-Duty Pistons Aftermarket Pistons Rings Valve-to-Piston Clearance Check Valvetrain ..................... 100 Camshaft Lifters Valve Springs and Retainers Rev Kits Rocker Assemblies Valves Valve Modifications Valve Grinding Gear Drives Front Covers ................ 108 Front Cover Seals Cam Stop Gear Drive Clearance Aftermarket Front Covers ..... Engine Lubrication 112 The Stock System Production Pump Clearances External Pumps Filtering Oil Additives Oil Leaks Intake System .............. 124 Stock Hardware Aftermarket and Stage I1 Hardware Fuel Injection ........... Ignition System 128 Buick Power Source Ignition Aftermarket Ignition Ignition Wires Spark Plugs Tachometers Glossary Exhaust System ........... 138 Stage I1 Exhaust Manifold Turbocharged Applications Recently Produced Buick Manifolds Operating Conditions/ Blueprinting Records ..I42 Engine Run-In Oil Fuel Coolant Engine Temperature Record-Keeping Forms Engine Parts ................ 162 Suppliers ................... .... 174 Buick Power Source 3 Pistons ............................. 94 Buick Heavy-Duty Pistons Aftermarket Pistons Rings Valve-to-Piston Clearance Check Valvetrain ..................... 100 Camshaft Lifters Valve Springs and Retainers Rev Kits Rocker Assemblies Valves Valve Modifications Valve Grinding Gear Drives Front Covers ................ 108 Front Cover Seals Cam Stop Gear Drive Clearance Aftermarket Front Covers Engine Lubrication ..... 112 The Stock System Production Pump Clearances External Pumps Filtering Oil Additives Oil Leaks Intake System .............. 124 Stock Hardware Aftermarket and Stage II Hardware Fuel Injection Ignition System ........... 128 Buick Power Source Ignition Aftermarket Ignition Ignition Wires Spark Plugs Tachometers Glossary Exhaust System ........... 138 Stage II Exhaust Manifold Turbocharged Applications Recently Produced Buick Manifolds Operating Conditions/ Blueprinting Records .. 142 Engine Run-In Oil Fuel Coolant Engine Temperature Record-Keeping Forms Engine Parts ................ 162 Suppliers ....................... 174 Bui ck Power Source 3

-Building a High-Perforn 4 his information and related specifications are intended to aid anyone pre- T paring a Buick V6 for heavy-duty or off- highway use. Basic engine specifications and building suggestions apply to road, oval track or drag racing unless specifically noted otherwise. Buick V6 engines have been built in the follow- ing displacements. Engine Specifications V6 Displacement Bore x Stroke Years Produced 198 3.625 x 3.200 1962-63 225 3.750 x 3.400 1964-67 231-3.8L 3.800 x 3.400 1975-86 2524.1L 3.965 X 3.400 1980-84 196-3.2L 3.500 X 3.400 1978-79 181-3.OL 3.800 X 2.660 1982-86 All current production Buick V6 engines (regard- less of displacement) are built on common tooling, which means items such as camshafts, valvetrain hardware, rod and main bearings, distributors, etc., are interchangeable. All production crankshafts, connecting rods and pistons are cast. Engines are built for manual and automatic transmission applications. In production there are front- and rear- wheel-drive blocks; the difference is in the bellhousing bolt pattern, oil pan flange and starter location. The heavy-duty Stage I and I1 blocks referred to in this volume are of a rear-wheel-drive bolt-pattern configuration and cannot be used in a front-wheel- drive configuration without modification. It is also important to understand that Buick- built V6 engines are used by other General Motors Divisions. You can readily identify the Buick-built V6 by noting that the distributor is placed at the front of the engine, whereas the distributor in V6 engines built by other GM divisions is at the rear of the engine adjacent to the bellhousing. Buick Motor Division is currently building both front- and rear-wheel-drive assemblies. While the machining of components (bore centers, etc.) is basi- cally the same, many pieces do not interchange be- tween front- and rear-wheel-drive engines. For in- stance, a front-wheel-drove block does not bolt to a rear-wheel-drive bellhousing or an automatic transmission. This volume concerns itself only with rear- wheel-drive hardware and the modifications needed to make that hardware heavy-duty. Competitive Combinations The Buick V6 engine is quite flexible in terms of the number of displacements that can be built using both production and aftermarket hardware. Displacements of 2.5 liters (151 cubic inches) to 4.5 liters (272 cubic inches) are easily attainable. The 2.5L and 4.5L engines should not be considered displacement limits for the Buick V6; they are simply practical limits. 2.5L (151 cubic inches) In 1979, Buick built some 3.2L (196-cubic-inch) engines in production. By using this 3.500-inch bore block and a production 3.OL crank having a stroke of 2.66 inches, the 2.5L V6 engine becomes a real- ity with a production block and crank. By using a 6.5-inch connecting rod, compression height of the piston is an acceptable 1.70 inches. Stage I cylinder heads would be adequate for this displacement. A professionally assembled engine built to these di- mensions can be raced at 8000 rpm. The 2.5L Buick V6 would be a formidable package in many forms of racing because it has a wide torque curve (much wider than the curves offered by the 4-cylinder engines it would be competing against). 3.OL (182 cubic inches) There are a number of competitive arenas for 3.OL engines. Currently, the 3.OL displacement can be raced in IMSA GT/P either normally aspirated or turbocharged. In addition to finding a home in SCCA's Trans Am class in turbocharged form, this package makes an impressive powerplant for midg- et racing. The 3.OL displacement can be reached with a 3.800-inch bore and a 2.66-inch stroke, which is a highly oversquare package. Stage I cylinder heads are adequate for this displacement if it is normally aspirated. A rod length of 6.35 inches is recommended for this engine. This is the same rod length that a production 3.OL engine has. As more Buick V6 competition engines are built, it is increasingly evident that rod length has little or nothing to do with horsepower or torque; so, you should consider using the longest rod practical to minimize cylinder wall loading. With the above mentioned dimensional package, some dome will be needed to obtain adequate compression ratio (12.51) for competition. If this engine is built using Stage I cylinder heads, rpm should be limited to 6500. Stage I1 valvetrain should be limited to 8500. 3.4L (209 cubic inches) Current CART/USAC rules allow turbocharged stock block engines to compete against exotic racing engines. Two-dimensional configurations of this displacement have been built-4.00 x 2.75 inches and 3.800 x 3.06 inches. Both configurations produced identical torque and horsepower. Both configurations have been built with 6.5- and 5.9-inch rods, again with no difference. Thus, for the sake of durability the configuration of 3.800 x 3.06 inches with a 6.5-inch rod is recommended. These engines can safely be taken to 8800 rpm. 4 Buick Power Source Buick heavy-duty parts are designed and manufactured for off-highway use only. T: hiS information and related specifications are intended to aid anyone pre- paring a Buick V6 for heavy-duty or off- highway use. Basic engine specifications and building suggestions apply to road, oval track or drag racing unless specifically noted otherwise. Buick V6 engines have been built in the follow- ing displacements. Engine Specifications V6 Displacement 198 225 231-3.8L 252-4.1L 196-3.2L 181-3.0L Bore X Stroke 3.625 X 3.200 3.750 X 3.400 3.800 X 3.400 3.965 X 3.400 3.500 X 3.400 3.800 X 2.660 Years Produced 1962-63 1964-67 1975-86 1980-84 1978-79 1982-86 All current production Buick V6 engines (regard- less of displacement) are built on common tooling, which means items such as camshafts, valvetrain hardware, rod and main bearings, distributors, etc., are interchangeable. All production crankshafts, connecting rods and pistons are cast. Engines are built for manual and automatic transmission applications. In production there are front- and rear- wheel-drive blocks; the difference is in the bellhousing bolt pattern, oil pan flange and starter location. The heavy-duty Stage I and II blocks referred to in this volume are of a rear-wheel-drive bolt-pattern configuration and cannot be used in a front-wheel- drive configuration without modification. It is also important to understand that Buick- built V6 engines are used by other General Motors Divisions. You can readily identify the Buick-built V6 by noting that the distributor is placed at the front of the engine, whereas the distributor in V6 engines built by other GM divisions is at the rear of the engine adjacent to the bell housing. Buick Motor Division is currently building both front- and rear-wheel-drive assemblies. While the machining of components (bore centers, etc.) is basi- cally the same, many pieces do not interchange be- tween front- and rear-wheel-drive engines. For in- stance, a front-whee I-drove block does not bolt to a rear-wheel-drive bellhousing or an automatic transmission. This volume concerns itself only with rear- wheel-drive hardware and the modifications needed to make that hardware heavy-duty. Competitive Combinations The Buick V6 engine is quite flexible in terms of the number of displacements that can be built using both production and aftermarket hardware. Displacements of 2.5 liters (151 cubic inches) to 4.5 liters (272 cubic inches) are easily attainable. The 4 Buick Power Source a High-Perforn 2.5L and 4.5L engines should not be considered displacement limits for the Buick V6; they are simply practical limits. 2.5L (151 cubic inches) In 1979, Buick built some 3.2L (196-cubic-inch) engines in production. By using this 3.500-inch bore block and a production 3.0L crank having a stroke of 2.66 inches, the 2.5L V6 engine becomes a real- ity with a production block and crank. By using a 6.5-inch connecting rod, compression height of the piston is an acceptable 1.70 inches. Stage I cylinder heads would be adequate for this displacement. A professionally assembled engine built to these di- mensions can be raced at 8000 rpm. The 2.5L Buick V6 would be a formidable package in many forms of racing because it has a wide torque curve (much wider than the curves offered by the 4-cylinder engines it would be competing against). 3.0L (182 cubic inches) There are a number of competitive arenas for 3.0L engines. Currently, the 3.0L displacement can be raced in 1M SA GT /P either normally aspirated or turbocharged. In addition to finding a home in SCCA's Trans Am class in turbocharged form, this package makes an impressive powerplant for midg- et racing. The 3.QL displacement can be reached with a 3.800-inch bore and a 2.66-inch stroke, which is a highly overs quare package. Stage I cylinder heads are adequate for this displacement if it is normally aspirated. A rod length of 6.35 inches is recommended for this engine. This is the same rod length that a production 3.0L engine has. As more Buick V6 competition engines are built, it is increasingly evident that rod length has little or nothing to do with horsepower or torque; so, you should consider using the longest rod practical to minimize cylinder wall loading. With the above mentioned dimensional package, some dome will be needed to obtain adequate compression ratio (12.5:1) for competition. If this engine is built using Stage I cylinder heads, rpm should be limited to 6500. Stage II valvetrain should be limited to 8500. 3.4L (209 cubic inches) Current CART /USAC rules allow turbocharged stock block engines to compete against exotic racing engines. Two-dimensional configurations of this displacement have been built-4.00 x 2.75 inches and 3.800 x 3.06 inches. Both configurations produced identical torque and horsepower. Both configurations have been built with 6.5- and 5.9-inch rods, again with no difference. Thus, for the sake of durability the configuration of 3.800 x 3.06 inches with a 6.5-inch rod is recommended. These engines can safely be taken to 8800 rpm. Buick heavy·duty parts are designed and manufactured for off-highway use only.

In the 1985 running of the Indianapolis 500, I stock block turbocharged Buick V6 engines were in r competition. In racing form, the engine produces more than 800 horsepower at 8000 rpm. Engine Features Configuration 90" V6, two valves/cylinder Horsepower 750 at 8000 rpm Torque 540 lbs./ft. at 6000 rpm Rev limit 8600 rpm Turbo boost 57 in. Hg-absolute Displacement 209 in" Ignition Buick Computer Controlled Coil Ignition Fuel system Port fuel injected/mechanical Bore 3.8 inches Stroke 3.06 inches Cylinder head Buick Stage 11, iron or aluminum Valve lifters Roller type with high-rev kit Crankshaft Buick forged, even-firing Block Buick cast-iron Stage II- four-bolt mains Fuel Methanol Compression ratio 9:l Intake valve 2.022-diameter titanium Exhaust valve Inconel 1.60 diameter Connecting rod Carrillo 6.5-inch Piston Forged-aluminum 1.5-inch compression height Oil pressure 100 psi Oil system Dry-sump pumps fitted to Buick Stage I1 block Pushrods 8.08-inch Cam drive Gear type Camshaft Hardened steel 4.OL (244 cubic inches) The 4.OL Buick V6, normally aspirated, but with fuel injection, readily fits into the rules of IMSA GT/P. This is endurance racing at its finest, a point you must keep in mind when building a Buick V6 for this type of competition. The 4.OL engine has been successfully built in two configurations. One combination features a 4-inch bore, a 3.23-inch stroke, and a 6.5-inch rod. The other combination utilizes a 3.830-inch bore, a 3.500-inch stroke, and a 6.380-inch rod. The rod length in both combinations allows a compression height of 1.400 inches, which in turn cuts down on piston invento- ry. Due to the nature of the racing, these engines should be limited to 8000 rpm. 4.3L (265 cubic inches) Several circle track associations have established classes for V6 engines limiting displacement to 265 cubic inches. These engines are easily built with a bore of 4 inches and a stroke of 3.5 inches, and with a rod length of 6.380 inches, a compression height of 1.400 inches is maintained. Like the other combinations, the 4.3L can be spun to 8000 rpm. 4.5L (272 cubic inches) When allowed for competition, this displacement engine can be fashioned with a 4.00-inch bore and a 3.625-inch stroke. By using a 6.300-inch rod, compression height is maintained at 1.400 inches. Once again, 8000 rprn is the practical limit of operation. All Displacement In all cases, the rprn limit has been established assuming titanium valves are being used. If steel valves are to be used, rev limits should be lowered by 1000 rpm. - Buick Power Source 5 ~nce~================ In the 1985 running of the Indianapolis 500, stock block turbocharged Buick V6 engines were in competition. In racing form, the engine produces more than 800 horsepower at 8000 rpm. Engine Features Configuration Horsepower Torque Rev limit Turbo boost Displacement Ignition Fuel system Bore Stroke Cylinder head Valve lifters Crankshaft Block Fuel Compression ratio Intake valve Exhaust valve Connecting rod Piston Oil pressure Oil system Push rods Cam drive Camshaft 90 0 V6, two valves/cylinder 750 at 8000 rpm 540 lbs.lft. at 6000 rpm 8600 rpm 57 in. Hg-absolute 209 in' Buick Computer Controlled Coil Ignition Port fuel injected / mechanical 3.8 inches 3.06 inches Buick Stage II, iron or aluminum Roller type with high-rev kit Buick forged, even-firing Buick cast-iron Stage II- four-bolt mains Methanol 9:1 2.022-diameter titanium Inconel l.60 diameter Carrillo 6.5-inch Forged-aluminum l.5-inch compression height 100 psi Dry-sump pumps fitted to Buick Stage II block 8.08-inch Gear type Hardened steel 4.0L (244 cubic inches) The 4. 0L Buick V6, normally aspirated, but with fuel injection, readily fits into the rules of IMSA GT/P. This is endurance racing at its finest, a point you must keep in mind when building a Buick V6 for this type of competition. The 4. 0L engine has been successfully built in two configurations. One combination features a 4-inch bore, a 3.23-inch stroke, and a 6.5-inch rod. The other combination utilizes a 3.830-inch bore, a 3.500-inch stroke, and a 6.380-inch rod. The rod length in both combinations allows a compression height of 1.400 inches, which in turn cuts down on piston invento- ry. Due to the nature of the racing, these engines should be limited to 8000 rpm. 4.3L (265 cubic inches) Several circle track associations have established classes for V6 engines limiting displacement to 265 cubic inches. These engines are easily built with a bore of 4 inches and a stroke of 3.5 inches, and with a rod length of 6.380 inches, a compression height of 1.400 inches is maintained. Like the other combinations, the 4.3L can be spun to 8000 rpm. 4.5L (272 cubic inches) When allowed for competition, this displacement engine can be fashioned with a 4.00-inch bore and a 3.625-inch stroke. By using a 6.300-inch rod, compression height is maintained at 1.400 inches. Once again, 8000 rpm is the practical limit of operation. All Displacement In all cases, the rpm limit has been established assuming titanium valves are being used. If steel valves are to be used, rev limits should be lowered by 1000 rpm. Buick Power Source 5

USAC Turbocharged Indy * BUICK STAGE I1 ENGINE BUILD AND CHECK RECORD Engine type Indy Displacement 3.4L Fuel requirement Methanol *57 inches of boost DL FP W VI 5 750 4 n ,700 2 5 ~JI 650 2 3. SJ 2- sz 550 P f3 3 2 500 k \I\ 5200 5800 6000 6400 6800 7200 7600 8000 8400 RPM I USAC Turbocharged Indy* BUICK STAGE II ENGINE BUILD AND CHECK RECORD Engine type Indy Displacement 3.4L Fuel requirement Methanol *57 inch es of boos t ... 6 Buick Power Source Buick heavy-duty parts are designed and manufactured for off-highway use only.

PISTON Piston make Diamond Compression height 1.485 Wristpin type; length Diamond 2.750 Wristpin diameter 0.927 Wristpin clearance in piston 0.0014 Wristpin retainer type Spirolocks PISTON SIZE AND BORE CLEARANCE Cylinder No. 1 3 5 Bore size 3.8000 3.8000 3.8000 Piston size 3.7924 3.7924 3.7923 Clearance 0.0076 0.0076 0.0077 Cylinder No. 2 4 6 Bore size 3.8000 3.8000 3.8000 Piston size 3.7925 3.7923 3.7923 Clearance 0.0075 0.0077 0.0077 PISTON RING Sealed Ring set make; part No. Power Top ring type; width; gap Moly. 1/16 0.020 2nd ring type; width; gap RBT 1/16 0.018 Oil ring type; width; gap %s Buick Power Source 7 PISTON Piston make Diamond Compression height 1.485 Wristpin type; length Diamond 2.750 Wristpin diameter 0.927 W ristpin clearance in piston 0.0014 Wristpin retainer type Sl2irolocks PISTON SIZE AND BORE CLEARANCE Cy linder No. 1 3 5 Bore size 3.8000 3.8000 3.8000 Piston size 3.7924 3.7924 3.7923 Clearance 0.0076 0.0076 0.0077 Cy linder No. 2 4 6 Bore size 3.8000 3.8000 3.8000 Piston size 3.7925 3.7923 3.7923 Clearance 0.0075 0.0077 0.0077 PISTON RING Sealed Ring set make; part No. Power Top ring type; width; gap Molyc. 1116 0.020 2nd ring type; width; gap RBT 1116 0.018 Oil ring type; width; gap 3116 Buick Power Source 7

How To Hotrod Your Buick V6 — High-Performance Tuning Manual

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