Mahle Rings Performance Steel Napier THM-13 4.065 x .043in .135RW Plain Ring Set

When you're rebuilding the top end of your engine, getting the piston rings seated properly is key to good compression and oil control. This Mahle OE Performance Steel Napier ring set is built for that job. The Napier hook on the second ring helps it rotate and maintain tension against the cylinder wall, which is great for keeping oil down and compression up, especially in engines that have seen some miles or are being built for performance.

This set uses a 4.065 inch bore size with a .043 inch top ring thickness and a .135 inch second ring width. The steel construction means they're well-built to handle the heat and pressure inside the cylinder. Mahle is a well-known name in engine components, and these rings are a popular choice for mechanics looking for a dependable part for their rebuilds.