CP Ring 86.7mm Bore Gas Nitrided Steel 1.0mm Top Ring THG 1.2mm 2nd Ring 2.8mm Flex Vent Oil Ring

The top ring on this set is made from gas nitrided steel, a tough material that holds up well against heat and friction. This is important because the top ring is the first line of defense against combustion pressure and heat transfer. The top ring measures 1.0mm, the second ring is 1.2mm, and the oil ring is a 2.8mm flex vent style, all designed to work together for a good seal.

This set is built for an 86.7mm bore size, which is a common size for many performance and stock rebuilds. The gas nitriding process hardens the surface of the steel, making it more resistant to wear and scuffing, which can extend the life of both the ring and the cylinder wall. The flex vent oil ring helps to scrape oil more effectively, reducing oil consumption and blow-by.