Driver Side Engine Piston Kit – GM (12658180)

Driver Side Engine Piston Kit is one of the pistons that converts combustion pressure into motion. Ring land dimensions and skirt coating are specific to the build, not to the displacement.

Replace the Engine Piston Kit during any rebuild that has the head off, and always when the bore shows vertical scoring. Piston-to-wall clearance is set by measurement, not by the part number alone.

Reference number for the Engine Piston Kit: 12658180. It is filed under Pistons, Rings & Cylinders, and it is the number that has to match the part coming off the vehicle.

This is genuine GM stock, supplied for the Engine Piston Kit with the manufacturer number intact so the reference on the box matches the catalogue.

Position matters here: this is the driver (left-hand) unit, and fitting it to the other side will not work. Supplied as a kit rather than as an individual component, so check that you need the whole item before ordering.