ok sorry about that i meant to ask being the intake is aluminum and heads are cast. the expansion from the engine will it cause the gaskets to leak or create a vucumm leak. the gaskets are not paper or metal fell like hard plastic. felpro brand ms 90361:rockon
I have no idea how you might think these are plastic:
There isn't a problem using them with cast iron heads and an aluminum intake manifold, seeing as how that's how the factory made it. The cork end seals aren't worth SHIT though, I can tell you from personal experience.