Ford 289-302, 5.0L with 7/16-14 Block Thread and 351W Style Heads with 1/2 holes in the head. Includes 1/2″ to 7/16″ insert washers. Head Style: Hex Nut. We have been in the performance business since 1995. We do not mark merchandise values below value or mark items as “gifts” – US and International government regulations prohibit such behavior.