Umbrella seals. I belive the valve guides have to be machined for these. I can't remember though. They just go over the tops of the valve guides. John
'68 C-10 - 250 with Edelbrock 600cfm 4 barrel, Offy intake, Hedman headers and true duals, HEI, MSD 6A box, relocated gas tank
Soon to have: T-5 tranny
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