Perf. Piston Ring Set V8 4.155 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.155 Bore 1.2x1.2x3.0 is engineered for serious V8 engine builders and performance enthusiasts who demand precision-machined internals for high-output applications. Whether you're rebuilding a stroker motor, refreshing a tired block, or assembling a custom performance engine, this NPR piston ring set delivers the compression sealing and blowby control required for reliable power delivery. Modern V8 performance builds—from naturally aspirated to forced-induction platforms—depend on quality ring sets to maintain cylinder pressure and prevent oil consumption.

This ring set features a 1.2mm top ring, 1.2mm second ring, and 3.0mm oil control ring geometry, sized for the 4.155-inch bore specification common in big-block and modern performance V8 builds. The three-ring stack configuration optimizes ring tension to seal combustion pressure while minimizing friction losses and controlling crankcase vapors. NPR's manufacturing process ensures consistent ring gap clearance and bore conformity, critical factors that prevent blow-by at high RPM and excessive oil consumption during sustained boost or high-load operation.

Engine builders and machine shops routinely specify NPR ring sets for custom V8 assemblies where OEM replacements may not meet performance or bore-size requirements. Proper installation during short-block assembly—with correct gap spacing and ring expander tension—ensures maximum efficiency and longevity. This Perf. Piston Ring Set V8 4.155 Bore 1.2x1.2x3.0 (MPN 20-GNHS4155K8) is the cost-effective, reliable choice for rotating assemblies targeting 500+ horsepower or extended track and street duty where compression stability and ring life directly impact overall engine reliability.