Mahle file-fit piston ring set sized 4.145" +0.005, supplied with 1/16, 1/16 and 3/16 inch ring sections for compression and oil control. This matched oversize set is intended for precise file-fitting during engine rebuilds, providing OEM-style ring profiles for reliable sealing. Proper end-gap and ring seating must be achieved by an engine machinist: the rings support cylinder reconditioning to the specified oversize with controlled installation.
Mahle MS 4.145in+ .005in 1/16in 1/16in 3/16in File Fit Rings