Heavy Duty Harmonic Balancer Bolt
Suit Small Block Chevy, with washer. Bolt accepts 1/2" drive ratchet

Aeroflow heavy duty high strength Chevy Balancer bolt kit is the best way to bolt on your balancer. This kit has a perfectly flat thick washer to spread the fastening load over a greater surface area. It also features a bolt that can accept a standard 1/2"" drive ratchet or breaker bar to rotate the crank assembly.