Mahle Rings Performance Plasma Steel Top Ring 4.305in x 1.0MM .143in RW HVOF Moly Ring Set

Mahle is known for making reliable OE replacement parts, and these performance piston rings are no exception. If you're rebuilding an engine, especially one where you want a bit more durability from the top end, these rings are a solid choice. They're designed to fit a 4.305-inch bore, which is common in many performance and heavy-duty applications.

The key feature here is the plasma-coated steel top ring. This type of coating is applied using a High-Velocity Oxygen Fuel (HVOF) process, which creates a very dense and hard layer. This makes the ring itself more resistant to wear and heat, which is crucial for engines that see harder use. The moly fill in the ring also helps with lubrication and sealing against the cylinder wall, reducing friction and improving compression.

Keep in mind these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for installation procedures and torque specifications.