ARP High Performance Series head bolt kits are tough. They are rated at 180,000 psi--15 percent stronger than Grade 8 fasteners. They come available with a reduced wrenching hex head or 12-point head that help eliminate the need for valvetrain removal when re-torqueing cylinder heads.

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ARP Header Studs, 12-Point Nuts, Custom 450, Black Oxide, For Chrysler, Small Block, V8, Set of 16

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