Perf. Piston Ring Set V8 3.905 Bore 1.2x1.5x3.0

The Perf. Piston Ring Set V8 3.905 Bore 1.2x1.5x3.0 is engineered for serious engine builders and performance enthusiasts who demand precision ring fitment and consistent compression across all eight cylinders. This NPR piston ring set is purpose-built for V8 engines with a 3.905-inch bore diameter, making it ideal for stock rebuilds, performance upgrades, and race engine applications where ring blowby must be minimized and reliability maximized.

Each ring in this three-piece set features the 1.2x1.5x3.0 configuration—a top compression ring at 1.2mm, a second ring at 1.5mm, and a 3.0mm oil control ring—designed to seal combustion pressure while efficiently managing crankcase vapors and oil return. NPR rings are manufactured to exacting tolerances that ensure proper bore fit, minimize wear-in time, and deliver consistent sealing across the full RPM range. The precise 3.905-inch bore sizing eliminates guesswork during ring installation, allowing you to achieve factory-correct clearances and avoid the costly mistakes of oversized or undersized rings that compromise ring seal and accelerate ring or cylinder wall wear.

This piston ring set is the go-to choice for anyone rebuilding or modifying small-block and big-block V8 engines in classic muscle cars, trucks, hot rods, and performance street builds. Whether you're restoring a Chevrolet, Ford, Mopar, or Pontiac engine, the NPR 20-GNHM3905K8 ensures that your fresh rebuild maintains proper compression, reduces oil consumption, and maximizes horsepower transfer to the wheels. Installation requires honing the cylinder bore to the correct finish and proper ring gap filing—standard procedures that any experienced engine builder will employ to guarantee optimal performance and longevity.