Description Reviews Anytime you are doing a valve job on a head you should replace all of the valve seals. Maybe you are trying your hand at a custom head; replace the seals before you do the testing. They live in oil and very hot temps and can wear out in 100,000 miles or less depending on the car. Fel-Pro is a great brand name that makes a quality gasket. Any head we do work on, we replace them with Fel-Pro gaskets! Comes with 16 valve seals to fit any Generation 1 car, Cooper or Cooper S.