Mahle Rings Performance Gas Nitride Steel 4.175 x .043 .157 RW Plain Ring Set

If you're rebuilding the top end of your engine, getting the right piston rings is crucial for proper sealing and performance. These Mahle OE Performance Gas rings are designed for a 4.175 inch bore with .043 inch top and second ring grooves and a .157 inch oil ring groove. They feature a nitride steel construction, which is a well-built surface treatment that helps them stand up to the heat and stress inside the cylinder.

Mahle has been a trusted name in engine components for a long time, and these rings are a solid option for many performance builds. The nitride treatment on the ring face helps improve wear resistance and ensures a good seal against the cylinder wall, which is key for maintaining compression and preventing oil from getting into the combustion chamber. They fit right into standard piston ring grooves, making installation straightforward if you're already doing a piston and cylinder work.