Are you looking for a head bolt reducer bushing for your Trick Flow® heads? Then you need a set of these Trick Flow® head bolt bushings. If your block uses a smaller diameter bolt than your head does, then one of these is what you need.

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ARP Header Bolts, Hex Head, 30mm UHL, 3/8 in. Wrench, Steel, Black Oxide, For Chevrolet, LS Engine, Set of 12

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ARP Header Bolts, Hex Head, 20mm UHL, 3/8 in. Wrench, Steel, Black Oxide, For Chevrolet, LS Engine, Set of 12

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ARP Header Bolts, Hex Head, 30mm UHL, Stainless Steel, Polished, For Chevrolet, Gen V, 6.2L, Set of 10

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ARP Header Bolts, Hex Head, 3/8 in. Wrench, Custom 450, Black Oxide, 3/8 in.-16, 0.875 in. UHL, Set of 16

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ARP Header Bolts, 12-Point, 3/8 in. Wrench, Custom 450, Black Oxide, 3/8 in.-12, 0.875 in. UHL, Set of 12

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