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Given what you report, I would disconnect the hose from the exhaust mixer down stream of the engine and see if you have water there when running and if not, work your way back to the manifold and finally the block. The elbow at the aft end of the manifold is notorious for snagging debris creating a blockage.
Without flow an acid soak is off the table. No flow = no acid getting into where it needs to be.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Last edited by ndutton; 05-12-2019 at 08:25 PM.
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