[Duane Eiskant II]

Grant is right, as ive seen them listed in the cometic book up to atleast .120 and im sure they could make them thicker if needed. As far as stacking, well i knew a guy one once had negative piston to valve clearence and glued a cooper gasket (god knows how many times they were used before hand) to a set of the fel pro hp gaskets and never had a issue. I know he did have to keep retorqing the cylinder head after it was run a few weeks till it crushed all the gaskets, and glue enough to keep the correct torque. Might not work for your combination but it did on his.