149 BUICK V6 BLOCKS Basic NASCAR Grand National engine. (Not sold as an assembly by GM.) BUICK V6 The Buick V6 started a revolution in motorsports. The solid success of the Buick V6 proved than an engine didn 9t need eight cylinders to be a winner.
This compact but powerful engine has flexed its muscles in championship drag racing, road racing, Indy cars, and oval track competition. Forward- thinking street rodders and performance enthusiasts have recognized the Buick V6 as a responsive and fuel-efficient powerplant. The increasing popularity of V6 engines in all types of motor racing ensures that the Buick V6 will have a permanent place in the American performance scene.
GM Performance Parts offers a full array of heavy-duty components for the Buick V6. From Stage II blocks and cylinder heads to valve covers and sophisticated electronic ignition, GM Performance Parts has the right stuff for the engine that launched a revolution. GROUP 0.001 BLOCK HARDWARE 24500621 4 Block Hardware Kit This hardware kit includes dowel pins for heads, front cover, and bellhousing, crankshaft bolts and washer along with woodruff keys for camshaft and crank.
Designed as a package to aid engine builders as these components are not included on blocks. ... more. less.
GROUP 0.033 ENGINE BLOCKS 25500152 4BStage II On-Center Block (4.1L) As its name implies, an con-center d Buick V6 block has its cylinder bores centered on the crankshaft 9s connecting rod journals. This eliminates the rod offset found in production and other heavy-duty Buick V6 blocks.<br><br> Both on- center blocks have the same features and cylinder bore diameters as the Stage II blocks, and use the same crankshafts, camshafts, and gear drives. Casting P/N 25500153. Technical Notes: On-center Stage II blocks require special connecting rods.<br><br> GM Performance Parts Buick V6 intake manifolds P/N 25500029 and P/N 25500170 have been updated to fit on-center blocks; earlier versions of these manifolds and some aftermarket manifolds may require modifications to fit on-center blocks. A production front cover must be shortened when used with an on-center block; the Buick V6 competition front cover P/N 25500169 does not require reworking. Deck height for all Stage II blocks is 9.535".<br><br> Block weight is 131 pounds. See the Buick Power Source Manual for recommended preparation procedures. GROUP 0.206 FRONT COVERS 25500169 B 4 Competition Front Cover This aluminum front cover is machined to accept a crank-fired ignition trigger.<br><br> It has clearance for a camshaft gear drive. Technical Notes: Use rear-wheel-drive water pump P/N 25527536, heavy- duty mechanical fuel pump P/N 25500121, and front seal P/N 24504098. Buick V6 90 Quick Reference Block Chart Part Number 25500152 Block Material Cast Iron Cylinder Wall Type Siamesed Cylinder Deck Height 9.535" Cylinder Bore Range 4.000" No Bearing Cap Bolts 4 Cap Bolt Orientation Splayed Bearing Cap Type Steel Crankshaft Journal Dia.<br><br> 2.75" Oil Sump Type Dry Crankshaft Seal Type 2 Piece Design Max. Stroke 3.625" Weight (lbs. 3 bare) 151 Intended Usage Professional Competition 150 BUICK V6 HEADS GROUP 0.269 CYLINDER HEADS 25500030 4 Stage II Cylinder Head (Aluminum) The aluminum Stage II cylinder head is a light alloy head with rectangular intake ports and square exhaust ports.<br><br> 10 0 valve angles, unfinished seats for 2.02" diameter intake valves and 1.60" exhaust valves are installed. This uses 3 / 4 " tapered seat spark plugs. Comes without valve guides installed.<br><br> Technical Notes : Stage II aluminum heads use the six bolt pattern found on Stage II blocks which require longer studs and are available from aftermarket sources. Requires rocker cover P/N 25500122, rocker cover gasket P/N 25500175, intake gasket P/N 25500173, exhaust gasket P/N 25500174, and intake P/N 25500029 or P/N 25500170. GROUP 0.289 HEAD GASKETS 25500171 4 Head Gasket This composition head gasket was developed for Buick V6 engines equipped with Stage II aluminum cylinder heads.<br><br> Its copper ring design provides superior sealing and prevents fretting of the head 9s deck surface. Technical Notes: This gasket fits 4.060" cylinder bores. Its compressed thickness is .040".<br><br> GROUP 0.386 ROCKER COVERS 25500122 4BStage II Rocker Cover Top off your Stage II engine with these cast aluminum rocker covers. A high-tech black crinkle finish contrasts with the machined Buick V6 logo. Perimeter bolt holes ensure an oil tight seal on all Stage II cylinder heads.<br><br> Technical Note: This cover does not fit production cylinder heads. 25500175 4BStage II Rocker Cover Gasket This die-cut composition gasket, fits all Stage II heads and rocker covers. CRANKSHAFTS GROUP 0.646 CRANKSHAFTS 25500008 4BRaw Crankshaft Forging This unmachined even-fire crank forging gives Buick V6 engine builders the freedom to use non-standard stroke dimensions.<br><br> It is forged from tough 4340 steel, and it will accommodate strokes from 2.66" to 3.625". The extra- large counterweights will provide proper engine balance with heavy-duty piston/rod assemblies. 25500172 4BStage II Competition Hub This lightweight, precision-machined crankshaft hub replaces the stock torsional damper.<br><br> It has dual interrupter rings to trigger the Buick Power Source electronic ignition system. 151 BUICK V6 IGNITION GROUPS 2.170 - 2.240 COILS AND HARNESSES 25500182 4BCoil - NASCAR Latest Buick cStand Alone d ignition system. Features integrated coil and module.<br><br> Rev-limiter and advance adjustment dial knobs are mounted on module. Military harness connectors. Requires only crank trigger impulse along with battery voltage to operate.<br><br> Tachometer output is available from harness. Mounting lugs are built-in and ground strap is included. Use P/N 25500189 or P/N 25500190 harness.<br><br> 25500190B 4BHarness - NASCAR Coil (EFI) Harness required for operation of P/N 25500182 coil in electronic fuel injection (E.F.I.) applications. Harness is same as P/N 25500189 but includes connector for E.F.I. interface.<br><br> 25500189 4BHarness - NASCAR Coil Harness required for operation of P/N 25500182 coil. Harness is 43" long and includes military connector for coil, crank trigger connector, tachometer output, and battery/ignition connector. For use with carbureted applications.<br><br> GROUP 2.361 DISTRIBUTORS 25500149 4 Electronic Distributor Light your Buick 9s fire with this heavy-duty electronic distributor. Its production Delco housing is outfitted with a high-output magnetic pickup that will trigger GM Performance Parts ignition control P/N 10037378. A hardened and polished shaft, reinforced pivot pins, cam ground advance weights, and a heliarc-welded upper advance assembly make this distributor the perfect choice for high-rpm racing applications.<br><br> Technical Notes: This distributor can be used with 3.8L and 4.1L even-fire Buick V6s. See the general parts section of this catalog for related heavy- duty ignition components. GROUPS 3.265 - .270 INTAKE MANIFOLD & GASKETS 25500029 4 Stage II Intake Manifold Your Buick V6 will breathe free with this aluminum high-rise four-barrel intake manifold.<br><br> Its single-plane design and tuned runners enhance high- rpm horsepower. Carefully engineered runner cross-sections promote even fuel distribution to all cylinders. An air gap beneath the runners insulates the intake charge from engine heat; there is no manifold heat riser passage.<br><br> The square carburetor pad is machined for a standard flange four-barrel. Technical Note : This intake manifold has been updated to fit Buick Stage II on-center blocks. 25500170 4 NASCAR Intake Manifold This aluminum intake manifold for on-center Stage II blocks is designed to provide the broad power band needed in circle track competition.<br><br> It features a single-plane design with an offset carburetor plenum and raised carburetor pad. Any size four-barrel carburetor may be used, but an adapter may be required to alter the flange bolt pattern. 25500173 4 Stage II Intake Manifold Gasket This composition intake manifold gasket fits all Stage II cylinder heads.<br><br> Its cPrint-O-Seal d construction prevents vacuum leaks, and the slotted bolt holes allow precise alignment. Technical Note: Port openings are 1.30" x 2.40". 152 BUICK V6 FUEL PUMPS GROUP 3.900 FUEL PUMPS 25500121 4 High Capacity Fuel Pump This fuel pump has increased capacity to satisfy the thirst of a strong- running Buick V6.<br><br> It has a die-cast housing, and can be used with alcohol fuels. Technical Note: This pump is designed for odd-fire camshaft noses; use with camshaft P/N 25500056. This pump has 1 / 4 "-18 fuel line holes.<br><br> TACHOMETERS GROUP 9.750 TACHOMETERS 25500151 4 Electronic Tachometer (3" Face) 25500150 4BElectronic Tachometer (5" Face) These quick-response electronic tachs are compatible with the Buick Power Source ignition system. The easy-to-read dials are marked to 10,000 rpm, and feature the Buick V6 logo. A built-in key access memory recalls the highest rpm recorded.<br><br> Technical Note: Both Buick electronic tachometers will work with an H.E.I. ignition system. " CHECK NEW LOW PRICES " Left to right: 25500150, 25500151 NOTES<br><br>