RBS stocks the highest quality SCE valley cover gasket on the market for the racers. Don't trust the cheap white ones that absorb oil and tear easily. These have a steel shim in them for strength and will last under the most extreme conditions.
Gasket is .095" thick laminate with Teflon coating on one side as well as NHRA approved. Fits all twelve bolt Donovan 417 Hemi lifter valley covers.