As soon as I get time in the shop, I plan to install the new water pump impeller kit and see if this cures the over heated exhaust problem. I got the module installed and set timing at 34 degree's at 3000 plus RPM, seems fine there. Have to solve this exhaust issue though, this is beginning to get old really quick!

So what happen good bad what, we were flowing this and then nothing, is it fixed what did you find? thanks.

+++

Follow up?

Head gasket?

I had to read through the entire post to make sure it wasn't mentioned but What about transom assembly water hose corroded? It seems like the only thing not mentioned and his symptoms are almost identical for that problem. Good enough flow at low rpm and at high rpm the exhaust gets hot. Be worth looking into?

^^^^^^^^^yep Bravo fever!!!!