What type of Header flange gaskets do our H2s have?

[tomp]

I need to pickup some flange gaskets for header installation. What type are required? O-ring style or regular/standard flat type?

[pdsq99f4]

The stock gaskets are metal multi-layered gaskets. The ones that come with most headers are more like the felpro soft style.

[tomp]

Which are better at leak prevention? Stock or aftermarket type?

[Humdingah]

If the stock are MLS I'd use the same type...they seem to be preferred for head gaskets, etc. as of late so I assume they'd be better on headers too.

[tomp]

I just bought the GM flange gaskets for the H2. They are actually metal O-ring type crush gaskets.

[mdoyle]

Just personel preference here- I use thin for stock exhaust manifolds where you have a machined surface mating to a machine surface.

For headers where you have a machined surface mating to a fabricated steel one, I like a thicker gasket. If it has a crush ring zone or screened copper-bearing sealant, that's even better.