Description Installing the Steeda Underdrive pullies or need to replace your stock harmonic balancer bolt? This replacement piece from ARP never has to be replaced and looks killer! As the crankshaft flexes, the damper absorbs incredible amounts of energy. These damper bolt kits from ARP will ensure that your balancer is locked into position. They feature a 1/4 in. thick wide-area washer and an extra-tall, 12-point head that accepts a deep socket to eliminate the fear of stripping the head.
