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    Do exhaust idle relief ports have to be sealed from the main (thru-prop) exhaust?

    I am doing an engine swap--replacing my 84 Merc 260R (350 chevy) with a late-model EFI engine. As part of the process, I am updating the old exhaust 3" risers and Y-pipe with the newer 4" y-pipe and risers. CONCERN: The old 3" Y has much larger idle relief ports, while the 4" pipe has a...
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