Supertech 91mm Bore Piston Rings - 1x3.5 / 1.2x3.80 / 2.8x3.5mm High Performance Gas Nitrided

In this set, you get a complete set of high-performance piston rings designed for a 91mm bore. These rings feature specific dimensions: the top ring is 1x3.5mm, the second ring is 1.2x3.80mm, and the oil ring is 2.8x3.5mm. They are gas nitrided, a process that hardens the surface of the rings, making them more resistant to wear and heat.

This gas nitriding treatment is a key feature for engines that see demanding use. It helps the rings maintain their seal against the cylinder wall under higher temperatures and pressures, which is crucial for consistent engine performance. The precise sizing ensures they fit correctly within the piston grooves and cylinder bore for optimal compression and oil control.

Please note that these piston rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for installation procedures and recommended ring gap settings.