Driver Side Engine Piston – GM (12654415)

Driver Side Engine Piston is a reciprocating component that seals the combustion chamber. Clearance and surface finish decide whether it seals correctly, so the bore has to be measured before a replacement is chosen.

Replace the Side Engine Piston when a leak-down test shows air escaping past the rings, when the skirt is scuffed, or when ring lands are cracked. Check the ring end gap in the bore it will run in.

This Side Engine Piston is listed as part 12654415 (Pistons, Rings & Cylinders). Where a number has been superseded, the current reference is the one that ships, so check any supersession note before ordering.

This is GM dealer-sourced stock rather than an equivalent, so the number on the Side Engine Piston traces straight back to the manufacturer.

This listing is specifically for the driver (left-hand) side; the opposite side is a separate part number.