Perf. Piston Ring Set V8 4.055 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.055 Bore 1.2x1.2x3.0 from NPR Piston Rings represents a critical internal upgrade for serious V8 engine builders and performance mechanics. These precision-engineered rings are engineered for applications requiring exact bore sizing and optimized ring geometry, making them essential for stroker builds, overbore configurations, and high-output street or competition engines. Whether you're assembling a big-block Chevy, Ford, or Mopar platform, selecting the correct piston ring set ensures proper ring seal, minimal blowby, and extended engine longevity under demanding driving conditions.

This three-piece NPR ring set features a 1.2mm top ring, 1.2mm second ring, and 3.0mm oil ring, a configuration that balances compression sealing with effective oil control across a 4.055-inch bore diameter. The 1.2-millimeter top and second ring thicknesses deliver reduced friction compared to older 5/64-inch designs while maintaining superior ring-to-groove fit and dynamic sealing across the full engine RPM range. NPR's manufacturing standards ensure consistent tension, proper end-gap clearance, and uniform ring face coatings that resist scuffing and scoring during break-in and sustained high-load operation.

Mechanics and engine builders trust NPR piston rings for rebuild jobs, performance overbore projects, and custom engine assemblies requiring OEM-equivalent or premium ring quality. The 4.055-bore specification suits applications where standard ring sets fall short, particularly in stroker engines with bored blocks or forged piston combinations. Proper ring installation—including accurate end-gap measurement, groove cleaning, and correct orientation—ensures these rings deliver the compression and oil control your rebuilt engine demands. Always verify bore diameter, ring thickness, and OEM specifications before purchasing to guarantee compatibility with your piston and cylinder configuration.