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The Holley heads, like most aftermarket small-block Ford heads, are drilled with holes for 1/2-inch head bolts, so they can be used on 351 Windsors. Ford 289s and 302s, however, use 7/16-inch head bolts. The solution is to get an ARP head-bolt kit that comes with hardened stepped washers (arrow) that center the smaller head bolts. View Related Article
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