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 a 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.

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 installation to ensure optimal performance.