SBC 7/16-20x2.750" heat treated billet chrome moly steel crank bolt. This bolt has the head lightened and uses a 1" inch hex head with a 1.450" washer to be used with a bearing support crank hub.
Bolt head has also been drilled and tapped 1/2-20" so you can bolt a drive mandrel out the front of the crank hub to drive an acc.
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