Bore:89.50 Over:+.020 Stroke:3.780 Rod:6.496 C/D:1.336 Head CC:46.0 includes rings, wrist pin, etc. 9.0:1 CR great for Turbo -Dome/Dish requires no deburring or preparation -2618 T6 high tensile forged aluminum -JE designs are specifically engineered for extreme applications up to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy. -Dome and dishes feature smooth flowing radii for excellent flame travel. -1.0 x 1.2 x 2.8mm ring widths. -.827 x 2.250 straight wall carbon steel wrist pin provided. -Pin fitting and wire locks included -Rings included