High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to faciliate cylinder head retorquing. All High Performance Series bolts are 180000psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

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ARP Header Bolts, Hex Head, Stainless Steel, Polished, 3/8 in.-16, For Oldsmobile, 330-455, Set of 14

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ARP Cylinder Head Stud, Pro-Series, 12-point Nut, For Chevrolet SB, Rodeck Aluminium Block, BD1010 & BD2000, Kit

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ARP Rocker Arm Studs, High Performance, 7/16 in.-20 Thread, 2.35 in. Effective Stud Length, Kit

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ARP Cylinder Head Bolts, 12-point Head, High Performance, For Chevrolet SB, 12-Rollover Brodix, 18 Brodix, Kit

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