Pontiac 400 455 Forged 4340 Steel Crankshaft 4.250" 2Pc-Seal External Bal.
|Rear Main Seal Style:||2-piece|
|Engine Stroke (in):||4.250 in.|
|Crankshaft Material:||Forged 4340 Steel|
|Requires Narrow Bearings:||See notes below|
|Rod Bearings Included:||No|
|Main Bearings Included:||No|
|Rod Journal Diameter (in):||2.250 in.|
|Main Journal Diameter (in):||3.000 in.|
|Minimun Rod Length (in):||6.625 in.|
|Balancer Bolt Thread Size:||Standard|
|Crankshaft Snout Style:||Standard|
|Notes:||Check the bearing to crank radius clearance. Rod bearings may need to be chamfered or alternatively use narrow rod bearings.|
Speedmaster forged standard weight crankshafts are designed for street or race engines with substantially increased horsepower. Speedmaster crankshafts are precision-ground, heat-treated, shot-peened, inspected, and micro-polished for superior tolerance control. Speedmaster crankshafts are also nitride-hardened for superior wear resistance, have straight-shot and chamfered oil holes, and feature lightening holes in all rod throws. These crankshafts also have a large radius on all journals for improved strength and wear resistance.