Mahle Rings Performance Napier THM-13 4.190 x .043 .135in RW Plain Ring Set

Mahle is known for making solid OE replacement parts that fit right. This THM-13 piston ring set is a great example, designed for a 4.190 inch bore size. It features a Napier hook on the second ring, which is a common design that helps scrape oil off the cylinder wall more effectively than a standard ring. This helps prevent oil from getting into the combustion chamber, which can cause blue smoke and fouled spark plugs.

The rings themselves are 0.043 inches thick, and this set is a plain ring style. These are designed to be a direct replacement for your existing rings, making the installation process straightforward if you're rebuilding your engine. Mahle OE parts are a popular choice because they offer reliable performance without breaking the bank.