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 Cylinder Head Stud, Pro-Series, 12-point Nuts U/C Studs, For Chevrolet SB, Dart II, Brodix Track I, 23 Pro Action, Kit

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ARP Header Bolts, Hex Head, 3/8 in. Wrench, Custom 450, Black Oxide, 3/8 in.-16, 1.000 in. UHL, Set of 12

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ARP Valve Cover Bolts, Stainless 12-Point, Stamped Steel Cover, Set of 8

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