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getting water in the carb and back two cylinders

I'm getting water in the carb and back two cylinders ; this is not a chevy
( though I own one) ; this is a 1972 inboard 4 cylinder gas engine in my
boat; I'm posting here as I  know and trust the wit of people in this group.



I think there are only  two ways for this to happen; a break in the water
jacketed intake/exhaust manifold or water pitching over the exhaust riser
back into the engine.

Most of the time the engine runs fine, for weeks of use, even when the
sailboat is healed over 40 degrees, but in a pitching sea it happens perhaps
half the time.

My question to the group:

Is it possible for the engine to run normally, which it does, with a
communication between the water jacket in the manifold and the exhaust ports
such that water would flow only sometimes between them ?



As for the idea of water coming back in from the exhaust; I've extended
the vertical drop of the riser, put a flap on the transom, put a one way
valve in the exhaust as close to the bottom of the riser as I can, cut out
as much of the exhaust line as possible ( to eliminate trapped water) cut
through bulk heads to lower the run of the exhaust line ( again to eliminate
trapped water that I ASSUME is being thrown back into the engine ) . I've
also taken to running her dry for between 5 to 10 seconds prior to cutting
the engine off; this seems to help - none of this has solved it.



Any suggestions (short of getting a power boat with a new engine ) greatly
appreciated.

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