Description

This ARP 135-2503 BBC Square Drive Damper Bolt Kit is for Big Block Chevrolet engines. This bolt can accept a standard 1/2″ drive ratchet or breaker bar to facilitate rotating the crank assembly. Made from Black-Oxide coated 8740 Chromoly Steel and nominally rated at 190,000 PSI. Precision machined for optimum thread engagement. This bolt is 1.550″ long, has a 1/2″-20 thread, has a Hex head and includes a washer.

ARP 135-2503 BBC Square Drive Damper Bolt Kit Fits:

• Big Block Chevrolet Engines

As the crankshaft flexes and twists, the harmonic damper absorbs incredible amounts of kinetic energy. To ensure that the damper is locked in position, ARP has developed these ultra strong 190,000 psi bolts that let you exert maximum clamping force.