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 Valve Cover Bolts, Chromoly, Black Oxide, Hex, 1/4 in.-20 Diameter, Cast Aluminum Covers, Set of 14

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ARP Cylinder Head Bolts, Hex Head, High Performance, For Jeep, 3.8L & 4.2L (232 & 258,), Kit

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ARP Valve Cover Studs, Black Oxide 12-Point, Mopar KB Hemi, 1/4 in. x 2.450, 20 Pieces

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ARP Cylinder Head Stud, Pro-Series, 12-point Head, BMC/Triumph, 1.3L & 1.5L Spitfire, Kit

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