What heads studs do I need?

RYC CUKR said:

The 302 block is drilled for 7/16" heads studs or bolts. However lots of aftermarket heads are drilled for 1/2" head studs or bolts. Check the specs on the Trickflow heads and see if they are drilled for 7/16" or 1/2" studs. If they are drilled for 7/16" then the part # is ARP-154-4001 if the heads are drilled for 1/2" studs then the part # is ARP 154-4005. The kit for the 1/2" holes has stepped washers that fit in the bolt holes in the heads to reduce them down to 7/16" so that everything is correctly located on the deck.

FWIW the aftermarket heads are drilled for 1/2" so that they can be used on 351Ws without having to be modified by a machine shop.

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