All gasket styles require a flat pan flange.
I’m betting if you take the pan off and lay it on a flat surface you will see out of flat areas, belled bolt hole, etc.
The reason we went from cork to the reuseable was the cork weeped after being in service because it lost compression from shrinkage.
All our warranty pretty much dried up after doing that, pun intended.
checking for a flat gasket surface will be done. I use the mopar deep pans and i'm careful about over torqueing. using a cast alum pan may hang down a little further than I want but i'll measure for that option.
