MAHLE 3903MS-112 File Fit Piston Ring Set Bore Oversize - 3.898in 005in

The MAHLE 3903MS-112 is a premium file-fit piston ring set designed for precision engine builds requiring exact end-gap specifications. This set is engineered for a 3.898-inch bore diameter with a +.005-inch oversize, providing optimal compression and oil control in performance and racing applications.

Key Features:

• File-fit design allows custom end-gap adjustment for precise fitment
• 3.898-inch bore diameter with +.005-inch oversize specification
• Complete ring set includes 1.0mm top compression ring, 1.0mm second compression ring, and 2.0mm oil control ring
• Manufactured by MAHLE using premium materials for durability and performance
• Thin ring pack design reduces friction and improves ring seal
• Ideal for custom engine builds, performance applications, and racing engines

File-fit rings require proper gapping using a ring file to achieve the manufacturer's recommended end-gap specifications for your specific application. This ensures optimal ring seal, compression, and longevity. MAHLE's precision manufacturing ensures consistent quality and reliable performance in demanding engine environments.