Duramax Cam And Crank Key KitIndustrial Injection Performance Cam & Crank Key Kit Eliminate the risk of engine damage by installing our high strength tool steel key ways into your crankshaft and camshaft. The factory Duramax crank uses a very small roll pin to hold the balancer and gear in place. The camshaft also uses a small roll pin to hold the gear in place. These small roll pins easily shear off causing catastrophic engine damage. By Installing our performance high strength