GROUP 0.001 BLOCK HARDWARE

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>

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