arp cylinder head bolts, hex head, high performance, for oldsmobile, 350-455, w/ factory heads or edelbrock heads, kit

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.