Norton Dominator Pistons/Pair 600/650cc Std. /Pair-
BOA36Norton Dominator Pistons/Pair 600/650cc Std. = 68mm
small piece on one piston broken off.
middle gudgeon pin-top: 40 mm
Gudgeon pin diameter: 17. 5 mm - 11/16"
at 600cc: 7,4:1 compression ratio at 650cc 8,25:1
Piston Clearance 0.12mm or 45thou
Mod. 77 v- 1956-58
Mod. 99 1956-62
Nomad 1968
650 1960-63
Mod. 99SS 1961-62
650 SS 1961-70