Perf. Piston Ring Set V8 4040 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4040 Bore 1.2x1.2x3.0 from NPR PISTON RINGS is engineered for high-performance V8 engines requiring precision ring fitment and optimal compression sealing. Built for serious builders and engine rebuilders, this ring set addresses the critical demand for tight tolerances and consistent blow-by control in modified V8 applications. Whether you're freshening a tired engine block or assembling a performance build from the ground up, quality piston rings are non-negotiable—they directly impact power output, fuel economy, and engine longevity.

This ring set features a 4040 bore diameter with a 1.2mm top ring, 1.2mm second ring, and 3.0mm oil ring configuration—a modern design that balances gas sealing efficiency with minimal friction loss. The NPR manufacturing process ensures consistent ring thickness, proper side clearance, and exact gap tolerances that prevent excessive blow-by or ring sticking during extreme combustion events. The 1.2x1.2x3.0 specification delivers superior oil control while maintaining the low-friction characteristics demanded by both naturally aspirated and boosted V8 engines operating at elevated RPM.

This piston ring set is ideal for engine rebuilders, performance shops, and enthusiasts restoring or modifying small-block and big-block V8 powerplants with 4040 bore specifications. Proper installation requires careful honing of cylinder walls to match NPR specifications and precise gapping for your intended application—critical steps that determine ring life and engine performance. Verify bore size, block casting number, and ring gap requirements before purchasing; this set is engineered for specific V8 platforms and demands precision assembly to deliver its full potential.