Automotive Racing Products (ARP) Harmonic Balancer Bolt 234-2502; 12-point 7/16 in. -20 2.470 in. Black Oxide 8740 Chromoly for Chevy 262-400

SB Chevy Socket Size- 1-1/16 Diameter/Thread Size- 7/16-20 UHL- 2.470 As the crankshaft flexes and twists, the balancer absorbs incredible amounts of kinetic energy. To ensure the balancer is locked in position. ARP has developed these ultra strong 200,000 psi bolts that let you exert maximum clamping force. Special features include 1/4in thick, wide area washer and an extra tall 12-point head that accepts a deep socket and eliminates the worry of stripping the head.