Mahle Rings Performance Napier Steel 2nd Ring 4.030in x 1.0MM .136in RW Plain Ring Set

If you're rebuilding the top end of your engine, getting the right piston rings is crucial for sealing the combustion chamber and controlling oil. This Mahle OE Performance Napier Steel 2nd Ring set is designed for a 4.030-inch bore, a common size for many performance and rebuild applications.

The Napier hook design on the second ring helps to scrape oil off the cylinder wall as the piston moves down, preventing it from entering the combustion chamber. This updated design helps reduce oil consumption and blow-by, contributing to a cleaner burn and more consistent engine performance. The steel construction offers good durability for these critical components.

Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for installation procedures and ring gap specifications.