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Hello there..I have had my head in the valve train, but I don't know the answer to your question.
However, since you on that side of the engine..between the flywheel and the valve opening there should be an embossed 6 digit date...i.e. 041976,, which is the date the block was cast on my '77 boat. Ignore the more prominent embossing number directly inboard of the flame arrestor...I am not sure what that is but maybe the mold for the block..it is usually 288xxx or something.
Folks that know more than me may know some details based on the age of the engine.
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-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
Last edited by sastanley; 01-08-2021 at 09:54 PM.
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