.060 over 350 4 bolt main with Callies internally balanced Forged steel 3.75" stroke crankshaft, 5.7 4130 forged stroker cap screw rods, Probe Forged lightweight full floating -4cc flat top pistons, fully studded block, Comp Cams camshaft and lifters, 1.6 ratio 7/16 full roller aluminum rocker arms