Norton Dominator Pistons/Pair 600/650cc Std. /Pair-

BOA36
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Norton 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