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    How important is the Exhaust seal flapper?

    Here's a diagram of what I'm talking about
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    How important is the Exhaust seal flapper?

    I've been slowly fixing up an '89 460 King Cobra. Recently found the exhaust seal flappers part #0765166 broken off in the bellows. My question is, how important is it to replace these 2 flappers located at the top of the Y exhaust pipe? I know the purpose is to prevent raw water from going...
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    OMC 460 King Cobra Serial Number

    Hey everyone, First post for me but have been reading lots of the topics lately and love the forum. I recently inherited an '89 Bayliner. We've been slowly fixing the engine and learning how unlucky we were to get an OMC. That being said, the engine is now idling perfect after some work...
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