Early Chevy 6 Cylinder engines can be really tough on a set of timing gears. They are an early form of gear drive which offers little or no "slack" in the valve train which can cause the gears to wear and often jump time as they get older.
Vehicle Fitment:
The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.