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TIN gaskets
Always use a exhaust gasket compound or silastic sealer with these.
These are the rarer ROUND port exhaust gaskets... used on many "Ram Air" & Super Duty & HO applications... from 68-74 era ... Not the normal exhaust gasket..
Noting too.. some exhaust RA manifolds had only THREE bolt holes..some 5...different years they did different designs.
Each gasket in this pair of premium gaskets has a graphite-impregnated facing.