Scat 4340 Forged steel crankshafts for the LS1/LS7 Chevrolet block offer choices of stroke beginning at 3.622 and running up to 4.250 allowing for cubic inch displacements that begin at 347 and run up to 454 cubic inches, assuming a 3.905/4.125 bore. Most strokes are available in Standard or Pro Series Lightweight, allowing the flexibility to tailor your choice for your particular application.