Crane Cams 11984-1 Pro Billet Timing Set for Chevrolet V8 Used with hydraulic roller camshaft Timing chain is double roller Camshaft and crankshaft sprocket material is made of Billet steel Maximum advance / retard at camshaft is 2 degree and crankshaft is 4 degree Backed by Crane's 1 year Warranty Policy under normal use