ARP Pontiac 1964 & earlier 326-421cid w/D-port head bolt kit 190-3608 Swift sport Porsche Boxster 2nd Gen 05-12

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Load capacity of the bearings has been determined in numerous Test Rig endurance tests under controllable conditions of load

ARP Pontiac 1964 & earlier 326-421cid w/D-port head bolt kit 190-3608 Swift sport Porsche Boxster 2nd Gen 05-12ARP Pontiac 1964 & earlier 326 421cid w D port head bolt kit (190 3608) ARP High Performance Series Cylinder Head Bolt Kits 190 3608 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. Brand: ARP Manufacturer's Part