GM HD TIMING CHAIN - 12646387

Chevrolet Performance Heavy Duty Timing Chain - 12646386 This is a heavy duty single roller chain that uses an improved alloy steel and the sideplates have an increased thickness to improve strength. If your are making cam change or a basic freshen-up on your engine, then you should consider replacing the timing chain.  This chain can be used on all LS engines and can be used with stock gears. NEW GM PART# 12646386 REPLACES OLD GM PART# 12586482