Review on COMP Cams 502 12 Valve Umbrella by David Causillas

There was a set of 16 for my Olds 455 but somehow 2 got lost when moving. A 12 pack costs about the same as 2 singles so I took it. They're a little thinner than the old Teflon seals that came with the 455s. The clearance between the valve rotators and the valve guides on the 455 is actually quite small, so thinner seals were required for my high lift cam. They go easy and they get the job done.