In our 1989 Fourwinns Vista we have 5.8 twins. They run well but overheat. When I bought the bought the previous owner stated the outdrives needed resealing so had that done. Now when I run the boat it overheats. Pulled the tstats and it still overheats. Changed the impeller and housing, and it still overheats. Now I want to look at the manifolds and risers. What should I look for? Any ideas. When I first start the boat it seems like the water will circulate, but after the engine warms up, it seems like the circulation stops. Help. Thanks.
