GM HD Timing Chain

OEM replacement timing chain for Gen 3 and 4 LS-based engines and Gen 5 LT engines.

PN: 12646386

NOTE: GM has switched suppliers for their timing chains and the new chains have a different part number. We are getting mixed inventory on our GM orders with new and old part numbers. The new part number is 12646387 and the old part number is 12646386. You may receive one of the new part numbers in your order. Once GM stops sending the old part number we will update this listing to reflect the new part number.