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the 351w in my '83, does it have roller lifters, or hydraulic lifters?? i am of the understanding that it is hydraulic, and i'm looking at this cam kit...
All the 351Ws came with hydraulic lifters (aka tappets) from the factory.
Before about 1994 they had flat tappets (the bottom of the tappet is simply flat, or actually very slightly convex), after this (except in Lightnings) they received roller tappets.