GM Heavy Duty Timing Chain - 12646387
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# 12646387 REPLACES OLD GM PART#'s 12646386 and 12586482
