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 Head, For Holden, 308 cid w/ 10, Kit

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MANLEY Bolts, SBC Brodix-12, Each

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