Chevy LS Forged 4340 Steel Crankshaft 4.000" 1Pc-Seal Internal Bal.

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Product Details


Brand: Speedmaster
Part Number: 1-276-004
Part Type: Crankshafts
Rear Main Seal Style: 1-piece
Engine Stroke (in): 4.000 in.
Crankshaft Material: Forged 4340 Steel
Engine Balance: Internal
Lightened: No
Requires Narrow Bearings: See notes below
Rod Bearings Included: No
Main Bearings Included: No
Rod Journal Diameter (in): 2.100 in.
Main Journal Diameter (in): LS Standard
Minimun Rod Length (in): 6.098 in.
Balancer Bolt Thread Size: Standard
Crankshaft Snout Style: Standard
Quantity: Sold individually.
Notes: Check the bearing to crank radius clearance. Rod bearings may need to be chamfered or alternatively use narrow rod bearings.
Tool: Stroker Combinations


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.

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