compression ratio 7:1, STD=71mm price per Pair Triumph, TR6,T120,T110 650cc Alloy Head pre unit + Iron Head if you wish to lower the compression of an iron head engine, these pistons can be used. Giving approx. 6.76:1
Piston Clearance 0.12mm or 45thou complete with Piston Rings, Gudgeon Pin and Circlips