Piston Compression Upper Ring – GM (19303439)

Piston Compression Upper Ring contains combustion in the cylinder bore and transfers force to the connecting rod. It is matched by bore diameter and ring groove width rather than by model year alone.

Replace the Piston Compression Ring when compression is low on one cylinder, when oil consumption climbs without an external leak, or when a teardown shows scoring in the bore. Measure the bore before ordering: standard size will not seal a cylinder that needs honing.

For this Piston Compression Ring the reference is 19303439, in our Pistons, Rings & Cylinders range. Compare it with the number on the part you are replacing rather than with a photograph.

Genuine GM part for the Piston Compression Ring. Where the manufacturer has superseded a number, the current reference is the one that ships.

This is the upper unit in the assembly; confirm the location on your vehicle before ordering.