These ARP High Performance series head bolt kits are tough! They are rated at 170,000 psi--15 percent stronger than Grade 8 fasteners. They come available with hex heads or reduced wrenching 12-point heads that eliminate the need for valvetrain removal when re-torquing cylinder heads.

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ARP Cylinder Head Stud, Pro-Series, 12-point Head, For Pontiac, 400-455 cid w/ Edelbrock Performer D port Heads 61579, 61599, Kit

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ARP Valve Cover Studs, Stainless, 12-Point, Cast Aluminum Cover, 1/4 in.-20 Thread, Set of 8

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