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496 exhaust manifold cleaning?


My 2004 366 with Volvo Penta 8.1’s has been fresh water its whole life. Worried about the cost of new risers and manifolds, I have the marina pull the riser after survey and they sent me this pic but would not elaborate on weather this was normal/acceptable buildup and certainly no offer of cleaning. Pretty sure they’d be happy to add up the $$$$ to replace though. So again I turn to the vast body of knowledge, experience, and general wisdoms this group has to offer!
1. Is this “Normal and serviceable/acceptable”?
2. If not, can/should they be cleaned?
3. If yes, how? Could a radiator shop dip the manifolds and risers? Who does this work?

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