Perf. Piston Ring Set V8 4.140 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.140 Bore 1.2x1.2x3.0 is engineered for serious engine builders and performance enthusiasts who demand reliability during high-output applications. Whether you're rebuilding a modified small-block or refreshing a street performance V8, this NPR piston ring set delivers the compression sealing and oil control needed to maximize power while protecting against blow-by and ring flutter. These rings are essential when boring your block or replacing worn rings in any V8 engine running 4.140-inch bore diameter.

The 1.2x1.2x3.0 ring geometry specifies compression ring and oil ring dimensions that optimize sealing dynamics and durability across a wide RPM envelope. NPR rings are manufactured to tight tolerances using premium materials that resist scuffing, thermal distortion, and rapid wear—critical factors when running boost, nitrous, or extended high-load sessions. The top and second rings handle combustion pressure containment while the oil control ring manages crankcase ventilation and reciprocating mass efficiency. This balanced design reduces oil consumption and maintains consistent ring gap wear throughout the engine's service life.

Builders working on Chevrolet small-blocks, LS variants, or comparable V8 platforms with 4.140-inch bores will find this set compatible with both cast and forged piston applications. Proper ring end-gap clearance and correct installation into grooves are essential—verify your piston manufacturer's specifications before assembly. This ring set suits street engines, weekend warriors, and dedicated race builds where cost-effective, proven compression control matters. Installation requires standard engine assembly knowledge; consider professional machine shop fitting if you're new to ring installation.