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Jack Shaft · 01-14-2021, 05:21 PM

Got a '36 and 2 '37 B's .They have the latest revision done during production.Some,but not all have hardened exhaust valve seats. The diamond foundry mark has never been identified. Anything else is speculation.

01-14-2021, 05:21 PM	#13
Jack Shaft BANNED Join Date: Dec 2019 Posts: 1,196	Re: "Diamond engine" Got a '36 and 2 '37 B's .They have the latest revision done during production.Some,but not all have hardened exhaust valve seats. The diamond foundry mark has never been identified. Anything else is speculation.