What is the 340 gasket bore in inches?

AJ/FormS said
Watch out!
Check out the method of determining the ICA; they use the 050 number plus 15*. That is not right. Or at least not right for a flat tappet hydraulic.

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Thanks for the reminder. I actually did not use that method, I used the actual intake valve closing at ABDC per the camshaft grinder.