MAHLE 4025MS Piston Ring Set Bore File Fit - 4.020 1/16 1/16 3/16

The MAHLE 4025MS piston ring set is designed for engines with a 4.020" bore diameter and features a file-fit configuration for precise end-gap adjustment. This standard tension ring set uses the popular 1/16", 1/16", 3/16" sizing configuration, making it compatible with a wide range of performance and stock rebuilds.

Ring Configuration:

• Top Ring: Ductile iron construction with plasma moly coating and barrel face profile for superior sealing and wear resistance
• Second Ring: Cast iron reverse twist design to control oil and enhance ring seal
• Oil Ring: 3-piece standard tension design for effective oil control

MAHLE Performance Engineering:

• Ultra-flat ring flanks maximize ring-to-piston groove sealing
• Advanced piston ring simulation and computer-aided design minimize friction for measurable horsepower gains
• File-fit design allows precise end-gap customization for optimal performance
• Standard tension configuration balances sealing performance with ring longevity

MAHLE's precision manufacturing and advanced coating technology deliver reduced friction, improved sealing, and enhanced durability whether on the dyno or the track. The 4.020" bore size with +.005" overbore dimension makes this set ideal for performance rebuilds requiring precise bore specifications.