Most exhaust flange gaskets, including header collector gaskets etc, are full surface flange. I would think that would be better than just a ring, as it would be more difficult for the exhaust to find a path out somewhere through the gasket.BadDog wrote: ↑Mon Feb 18, 2019 1:21 pm Not familiar with that stuff. Good to know, thanks. Do you think that a full surface gasket of that stuff would be better than the narrow width remaining of the steel/fiber resulting from the 9/32 over size diameter hole in the gasket I modified to fit? Call it roughly 1/8" wide where about 1/4" wide sealing width would be possible with a (just over) 2" ID hole in the gasket material in question? Not sure how much the steel inner will offset the loss of sealing width...
Most I've made, I cut the exhaust hole with an Exacto knife, and did the bolt holes with a hole punch. For the outside, I just use the ol' ballpeen hammer trick.
I snug fit on that pipe would make it more user friendly to assemble. The gasket won't fall off and go into the black hole somewhere.