Complete engine kits include pistons, ring sets, pistons pins, retainer clips and head gasket All Wiseco pistons are forged from aerospace aluminum alloys on Wiseco's state-of-the art forging presses Built on a legacy of championships for over 60 years by American craftsmen Wiseco pistons have the latest dyno-tested technology to out-perform the competition. PISTON KIT KAW500 60.5MM