Mahle Rings Perf 4.200in x 1.5MM .151 RW Plasma-Moly Steel Top Ring Moly Ring Set (48 Qty Bulk Pack)

Starting with a 1.5mm plasma-moly steel top ring, this Mahle OE ring set is built for demanding engine builds. The plasma-moly coating on the top ring is a tough surface treatment that helps resist wear and reduce friction, which is crucial for engines that see a lot of use or are built for higher performance. This bulk pack contains 48 sets, making it a solid option for shops or builders working on multiple engines with a 4.200-inch bore size.

The rings are designed with a specific profile for the top ring (RW) and a moly-filled second ring, aiming for a good seal against the cylinder wall. This combination helps maintain compression and control oil, both vital for engine health and performance. Mahle is a well-known name in engine components, and these rings are made to their OE standards, meaning they are well-built and intended to fit right into the piston grooves for a proper installation. You'll want to ensure your pistons are grooved correctly for the 1.5mm top ring and .151 inch oil ring width to get the best performance out of this set.

Because this is a bulk pack of 48 sets, it's ideal for engine builders or performance shops that frequently work on engines requiring this specific bore size and ring configuration. Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your specific engine build's requirements and manufacturer's installation guidelines to ensure proper fitment and performance.