LS1 Stroker Kits 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. BC 4340 forged crankshaft gun drilled for weight savings a double keyway for added support. BC 4340 steel billet H Beam connecting rods equipped with ARP2000 7/16" fasteners. Choice of CP Bullet Series or JE shelf pistons or custom CP or JE brand pistons made to any spec. 5100 alloy wrist pins and ductile iron plasma top rings tapered second ring low tension oil rings. ACL Race Series rod and main bearings are available for additional cost. Available as fully system balanced and ready to install for additional cost or self balance. For more information visit http://www.briancrower.com/makes/chevy/ls_stroker.shtml