Absolutely. it is possible for water to run back into the engine if the riser isn't high enough. You need a risen area right after the manifold if it can be done. Also ensure your water lift muffler is oriented and installed correctly.
I've tried to upload a sketch here. This is how my C&C 30 is done. Note that rise right after the manifold...if there is room make that happen and it cuts out a lot of grief.
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Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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