CR Piston Ring Set 4.175 Bore 1/16 1/16 3/16

The CR Piston Ring Set 4.175 Bore 1/16 1/16 3/16 is engineered for serious engine builders and mechanics performing high-performance cylinder head and block work. These rings are essential when boring or resizing cylinders to 4.175 inches, ensuring proper gas sealing and oil control in modified or rebuilt engines. Whether you're restoring a vintage powerplant or optimizing a modern performance build, quality piston rings directly impact compression, power delivery, and engine longevity.

This ring set features a 1/16-inch top compression ring, 1/16-inch second compression ring, and 3/16-inch oil control ring configuration—a proven three-piece design that balances gas sealing with minimal friction and effective oil scraping. The dual 1/16-inch compression rings reduce blowby and maintain peak combustion pressure, while the heavier oil ring prevents cylinder wall washdown and maintains proper bearing lubrication. Precision manufacturing ensures consistent ring gap and side clearance, critical tolerances that prevent sticking, excessive wear, and catastrophic engine failure during break-in or high-RPM operation.

These rings are ideal for mechanics reboring cast-iron or aluminum blocks to 4.175-inch diameter, whether for stroker builds, displacement increases, or cylinder damage repair. Proper installation requires honing the cylinder bore to the correct finish (cross-hatch pattern), careful ring gap measurement, and meticulous piston-to-wall clearance verification. Installation weight of 1.15 lbs reflects a standard four-cylinder ring set; always verify bore diameter and ring groove dimensions against your specific engine block before ordering.