I am having trouble with the risers I put on my 34' wellcraft st.tropez. I have installed a rebuilt 7.4 which is a genV and put the risers and manifold from the old motor, which were new with 10 hours on them. When I filled the closed cooling system with anti freeze the coolant ran out the exhaust. I removed the heat exchanger and had it checked, it's fine. When I installed the manifolds and risers I used a kit I purchased from OMC, which was supposedly for these manifolds. The riser gaskets were open on all sides, which I suspect is the issue. I think the riser gaskets should be closed. I stopped at west marine and was told the riser gaskets should be the ones with the restrictor hole, not completely closed. However I think if I use the gasket with the restrictor hole i still will have coolant exiting out the exhaust. I'm pretty handy but this has got me confused. Does anyone know which riser gasket is the correct one.
