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The Mahle plain piston ring set is a precision replacement sized Napier THM-13 3.759 x 1.2 mm with a .135in ring width, intended for piston rebuilds and restoring compression and oil control. These plain rings deliver factory-style profiles and accurate sizing to help ensure consistent ring seating and predictable ring end gaps during engine overhauls and routine rebuilding tasks in automotive applications.
Mahle Rings Performance Napier THM-13 3.759 x 1.2MM .135inRW Plain Ring Set
