Stroke: 81.4 mmDisplacement: 1677 ccmWossner Comp. Ratio: 9.0:1OE Comp. Ratio: 9.4:1Piston Weight (grams): 274 gramsnote: price includes rings, wrist pins, clips and low friction skirt coatingBore Sizes: 81.00 - Kit Part No. K9428DA, 81.50 - Kit Part No. K9428D050, 82.00 - Kit Part No. K9428D100