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Harmonic Damper Bolt Kits:

 

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Harmonic Damper Bolt Kits
As the crankshaft flexes and twists, the 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. Special features include 1/4" thick, wide area washer.
Part No. Description

860-134-2501

Small Block Chevy 7/16" diameter, 5/8" head
860-135-2501 Big Block Chevy 1/2" diameter, 5/8" head
860-150-2501 Ford 5/8" diameter, 5/8" head