V-FACTOR (Moly) 54ci - 900cc STD Displacement 9.5:1 (Std. Compression) Ratio +.040 OS Bore Size Fits Ironhead Sportster 1957/1971

V-FACTOR (Moly) 54ci - 900cc STD Displacement 9.5:1 (Std. Compression) Ratio +.040" OS Bore Size Fits Ironhead Sportster 1957/1971

High quality cast piston kits that meet or exceed original equipment specifications
Compression ratio listed with each piston
Sold each with piston pin and lock rings
Low compression pistons enable the use of pump gas without detonation
See the engine section for piston ring sets
Moly part numbers have molybdenum coated shirts to help prevent cylinder wall scuffing
Note: * It is not recommended to bore Sportster 1972/Early 1973 models more than .030" OS