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All Edelbrock Ford heads have 1/2-inch bolt holes for 351W motors. To install them on a 289 or 302 (which use 7/16-inch bolts) you must use a set of Edelbrock head-bolt bushings (PN 9680, right). Use them in place of the supplied ARP washers (left) that come with ARP’s 7/16-inch Ford head bolts (center). View Related Article
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