i should know this, but.............i dont. i have the original long style manifolds (925-26) on my 425 car. in 2001 when i put the car together, i made some gaskets out of that white header gasket paper. it fails on headers and now i see it fails on manifolds as well. i pulled the right side manifold away and cleaned up both surfaces. because of lack of gaskets and a coolant drip, i buttoned the manifold up tight. have heard this will work.....never tried before. kinda thought they had those silver metal gaskets stock. dont know for sure. if i need them......where will i get them?. if i dont need gaskets, then one side is done. thanx for your input.