Quote:

It is not "necessary" to use any gasket facing pieces with the stamped valley pan.
My thought is these are mainly used as a "shim" if you will, to properly align and fill a gap between the intake ports in the head with the ports on the manifold depending on how much material that may have been removed from block decking or cylinder head milling.
They can however provide additional sealing characteristics due to the material composition.

Superformance Products now offers these gaskets made from Interface Solutions NI-2085 material, better than anything available on the market for this application part #6404.



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Greg , what was the material you used to make them from ? I have some that are gray paper , came vac packaged 4 to a set on white cardboard , can't remember if these were from you ??