ARP 135-2501 Harmonic Balancer Bolt Kit

Chevrolet Big Block, 5/8 socket size, 1/2-20 Diameter/Thread size, 1.550 Under Head Length, ARP 135-2501 Harmonic Balancer Bolt KitARP Chevy Harmonic Balancer BoltsAs the crankshaft flexes and twists, the balancer absorbs incredible amounts of kinetic energy. To ensure that the balancer is locked in position ARP has developed these ultra strong 200,00 psi bolts that let you exert maximum clamping force. ARP Chevy Harmonic Balancer Bolts has Special features include 1/4 thick, wide area washer and an extra tall 12-point head that accepts a deep socket and elimates the worry of stripping the head.