Stroke: 77 Displacement: 1586ccmWossner Comp. Ratio: 11.8:1 OE Comp. Ratio: 10.0:1 Piston Weight(grams ): 274 Wrist Pin: 20mmnote: price includes rings, wrist pins, clips and low friction skirt coatingââBore Sizes: 81.00 - Kit Part No. K9035DA, 81.50 - Kit Part No. K9035D050, 82.00- Kit Part No. K9035D100