Piston Ring Set 4.135 Moly 1/16 1/16 3/16

The Piston Ring Set 4.135 Moly 1/16 1/16 3/16 is engineered for serious engine builders and performance mechanics seeking precision ring control in modified or high-output applications. Whether you're assembling a stroker, boosted engine, or competition build, this ring set delivers the compression sealing and oil control that separates a well-tuned powerplant from a leaky, inefficient one. Designed for 4.135-inch bore pistons, this set addresses one of the most critical seal points in any internal engine build—the interface between piston and cylinder wall.

The 1/16 compression ring, 1/16 secondary compression ring, and 3/16 oil ring configuration is the industry standard for controlled blow-by and effective oil return to the sump. The moly-coated top compression ring resists scuffing during cold starts and under sustained high load—critical when cylinder pressures climb beyond stock parameters. Moly coating also extends ring life by reducing wear rates on both the ring face and groove, allowing you to push harder without premature ring flutter or gas leakage. The dual compression design spreads pressure load across two rings, improving sealing consistency across the rpm band while the heavier oil ring ensures consistent film strength on the cylinder wall, preventing oil consumption and deposit buildup common in turbocharged or supercharged engines.

This ring set fits any 4.135-inch bore piston, making it ideal for big-block Chevrolet, LS-based strokers, and aftermarket forged piston builds where OEM rings fall short. Installation requires proper ring gap filing and groove inspection to guarantee optimal performance—measure end gaps cold (typically 0.020 to 0.035 inches for compression, 0.015 to 0.025 for oil), and always bed rings in gradually to promote proper seating. Mechanics working with performance engines, fuel injection conversions, or nitrous/boost applications will find this set essential for maintaining cylinder pressure, preventing blow-by, and extending engine longevity under stress. Compact packaging (5.7 x 2.05 x 10.7 inches) makes storage and handling convenient on any shop shelf.