Dave O'Brien
Member
I've got a 706 gas that runs really loud. Doesn't matter if it has a straight pipe or a muffler. There are no visible holes/leaks/cracks in the manifold. I did find a leak at one corner of the manifold where it bolts to the head on the exhaust. The gasket had blown out. I replaced the gasket with what was on it which was a typical 1/16th" material. I seem to recall something from a post on here about there being two different manifold gaskets for the C-263. Amazingly enough, I found one of the thicker, metal on both sides type in a stash here at home. Any thoughts or suggestions are welcome.