Pro-Series Steel Billet Gear and Roller Chain Sets are CNC-machined, and nitride hardened, to produce precision accuracy and maximum strength.  Torrington bearing is fitted on the camshaft sprocket. The billet 4140 steel crankshaft sprocket features nine separate keyway locations, providing up to eight degrees of advance or retard.  The crankshaft sprocket is NOT recessed.  The crankshaft sprocket thickness is .610".

NOTE:  Due to the increased width of the sprockets and chain, clearance must be checked between the timing set and the block casting.  Some applications may require minor grinding of the block for clearance.