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 designed for serious V8 engine builders and performance enthusiasts who require precision-engineered components for high-output applications. This piston ring set is ideal for those rebuilding stroker motors, refreshing older blocks, or assembling custom performance engines.

Featuring a 1.2mm top ring, 1.2mm second ring, and a 3.0mm oil control ring, this set is specifically sized for the 4.155-inch bore common in modern V8 builds. The three-ring stack configuration optimizes ring tension to effectively seal combustion pressure while minimizing friction and controlling crankcase vapors. NPR's manufacturing process ensures consistent ring gap clearance and bore conformity, which are critical for preventing blow-by at high RPMs.

Engine builders and machine shops often choose NPR ring sets for custom V8 assemblies where OEM replacements may fall short of performance or bore-size requirements. Proper installation during short-block assembly, with correct gap spacing and ring expander tension, is essential for achieving maximum efficiency and longevity in performance applications.