Timing Cover – GM (12633906)

Timing Cover is a containment or structural component matched to a specific casting and bolt pattern. Parts that look interchangeable often differ in offset or internal volume.

Replace the Timing Cover when the casting is cracked at a mounting point, when a mating flange is no longer flat, or when the original has corroded through. Check the surface it seals against before fitting a replacement.

For this Timing Cover the reference is 12633906, in our Camshafts & Timing range. Compare it with the number on the part you are replacing rather than with a photograph.

The stock here is genuine GM, and this Timing Cover keeps the original engineering number, which matters once a number has been superseded more than once.