Small Block Chevy 7/16" diameter, 5/8" head
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.