These high compression pistons feature a 7cc raised dome to achieve a compression ratio of 11:1 (from 9.5:1). Higher compression is a key factor in increasing performance.
Stock | S&S 650 HC Kit | |
Bore X Stroke | 78 x 67.8mm | 78 x 67.mm |
Compression Ratio | 9.5:1 | 11.0:1 |
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