I know where you're going there Mike. Military engines might need to be compatible with lower octane fuel. Carb B20's max CR 9.5:1 but these might just have it lowered a bit with a thicker head gasket. Some of the very last UK 140's had 8 bolt cranks along with other metric internal parts. First 240's also had an 8 bolt B20 but I don't think there were any imported here or indeed made in RHD. That might make these flywheels rare but because they are for an equally rare engine might not make them more valuable.
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