Check the listing for details. K1 Crankshaft for Chevrolet LS1 3.622" Stroke High-Performance Upgrade. Condition: New. Listed at 699.00 USD. Notice: Product Images may differ from the actual product. Image may be a representation of this item. K1 Technologies Chevrolet LS1 Crankshaft, 3.622 in. Stroke, 2.650 .in Main Journal, 2.100 .in Rod Journal, 6 Bolt Flange Type, Forged 4340 Steel.K1 Technologies crankshafts are made from 4340 forged steel, core hardened and nitride hardened for optimum strength, increased fatigue life and minimized distortion. To help ensure consistent quality each crankshaft is magnetic particle tested to ensure it is free of flaws and journal tolerances are held to +/- .0001” to ensure consistent bearing clearances.Manufactured from forged or billet premium 4340 steel ~ Engineered specifically for high-stress racing applications ~ Nitrided for improved strength and bearing life ~ Large fillet radii for improved strength ~ Straight hole oiling system for improved lubrication ~ Size tolerances held to +/- .0001 in.