The BC stroker kit for the Chevrolet LS Series engine incorporates your choice of stroke, from 4.000", 4.100", 4.125" and 4.250", the BC crankshafts are CNC machined from 4340, non-twist steel. Depending on bore size that you decide, the BC kit will take you up to 471 CID with a safe 4.200" bore using Darton sleeves. The BC LS Series kit utilizes premium steel billet connecting rods. As usual, each BC kit features custom CP or JE pistons, wrist pins, and full ring pack. Big time horsepower and torque gains.