K1 Chevy Ls1 Series. 4.100" C/Shaft. 58 Rng

K1 - Crankshaft

Part  012FAE41058

Application:
This is a performance forged crankshaft designed for Chevrolet LS series engines, including LS1, LS2, LS3, LS6, etc. — essentially any LS block that uses the same journal sizes and 6‑bolt crank flange pattern.

• Engine Family: Chevy LS (Gen III/IV) engines.

Key Specifications

• Stroke: 4.100″ — this makes it a stroker crank, increasing displacement when paired with the right rods & pistons. 

• Main Journal Diameter: 2.599″ (approx.) — standard for LS engines.

• Rod Journal Diameter: 2.100″ — fits LS rods.

• Material: Forged 4340 steel — high strength with nitride hardening.

• Counterweight/Balance: Internal counterweights; reluctor wheel with 58 teeth included for crank position sensor use (essential for ignition/ECU timing systems). 

• Flange Type: 6‑bolt LS crank flange — standard LS pattern.

• Reluctor Wheel: 58‑tooth crank reluctor wheel (58X) for LS engine ECU triggers.

• Bearings: Not included — main and rod bearings must be sourced separately. 

• Weight: ~54 lb (crank weight) — typical for stock‑style LS crank weight. 

• Minimum Recommended Rod Length: ~6.098″ for optimal geometry on a 4.100″ stroke.