Perf. Piston Ring Set V8 4.035 Bore 1.2x1.5x3.0

The Perf. Piston Ring Set V8 4.035 Bore 1.2x1.5x3.0 from NPR Piston Rings is engineered for serious V8 builders and engine rebuilders who demand precision compression sealing and reduced blowby in high-performance applications. This ring set is specifically designed for large-displacement V8 engines with a 4.035-inch bore diameter, making it ideal for stroker builds, race engine modifications, and full rebuilds where OEM or oversized replacements are required. Whether you're assembling a street performance engine or preparing for track duty, proper piston ring selection directly impacts cylinder pressure retention, oil consumption, and overall engine efficiency.

NPR's performance ring geometry features the 1.2mm top ring, 1.5mm second ring, and 3.0mm oil ring configuration—a proven design that balances ring tension, sealing capability, and bearing load distribution across the piston skirt. The top compression ring provides primary combustion sealing while resisting detonation and heat stress, the second ring acts as a secondary seal and scrapes carbon deposits, and the oil control ring manages crankcase ventilation and cylinder wall lubrication. This three-piece stack design minimizes friction losses compared to thicker rings while maintaining adequate contact pressure against the cylinder wall, critical for engines operating at elevated RPM and boost levels.

Engine builders working on big-block and small-block V8 platforms—including Chevrolet LS, big-block Chevy, Ford 427/460, and comparable aftermarket blocks—will find this ring set compatible with custom piston packages and stroker combinations. Proper installation requires meticulous ring end-gap measurement and verification to cylinder bore specifications; most professionals recommend 0.003-inch clearance per inch of bore diameter for the compression rings. Pair this ring set with quality honing, fresh cylinder wall preparation, and precision pistons to achieve peak compression, minimize startup blowby, and extend engine longevity in both street and competitive applications.