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    Do you need flapper valves on Mercruiser engine?

    I was told by a Mercruiser Shop that they do not replace flapper valves in standard exhaust anymore. They showed me a bulletin from Volvo-Penta stateing to leave them out as they are more trouble then what there worth. Any opinions? BTW my engine is a Merc 5.0 Carb.
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    99 Monterey Explorer mercruiser 5.0 sluggish and drinking fuel

    Hello, New to the forum but been a boater for years, I'm at a bit of a loss on what to do next. I've got a 99 Monterey Explorer 22 foot deck boat 3500lbs. It is the 230hp 5.0 2 barrel carburated engine. I just bought and I'm having a problem getting more then 4100rpm at wot and 33mph no load in...
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