Manufacturers

ARP Reinforced Crankshaft Bearing Bolts/Studs

ARP Reinforced Crankshaft Bearing Bolts/Studs 

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ARP Reinforced Crankshaft Bearing Bolts/Studs
As power climbs, the main bearing cap starts to work and the standard bolt, sized for production use, eventually stretches. ARP studs take that load with a higher and, more importantly, a far more consistent clamping force from one cylinder to the next. Eight part numbers are active here. The items specific to the main bearing carry a code beginning with AM, the AM5.000-1LB stud, the AMN12-1 nut and the AMW750N washer, which allows a set to be built up or a single item replaced. Three generic 8740 chromoly bolts, 665-1005, 665-1008 and 665-1011, round out the range for a bespoke build. Tighten by stretch or by torque, with the thread lubricated.