Tom,
You guessed it right. As soon as we pulled the intake, I told him thats where the problem had been. I did know that he overheated it once, and he was really concerned about the headgaskets.
On boats, since they are so hard to work on, once it's out, do it all.
So we are going to go through it and do some re-fresh and replace all the gaskets and drop it back in.
It's had some good work done to it. All Hi-Po lower end, crank rods and pistons. I've been on the boat and it flies!
Enjoyed the visit!
Skip