Speedmaster PCE306.1040 4.060" Bore Plasma Moly Piston Ring Set - 1.5/1.5/3mm Zero Gap

The Speedmaster PCE306.1040 is a precision piston ring set engineered for high-performance engine applications. Featuring a 4.060" bore diameter with 1.5mm top ring, 1.5mm second ring, and 3mm oil ring specifications, this set delivers the durability and sealing integrity required in demanding conditions. The plasma moly coating enhances wear resistance and longevity, while the zero gap design minimizes blowby and optimizes compression retention.

This piston ring set is ideal for builders and enthusiasts working with performance or racing engines where precise fitment and material quality are critical. The plasma moly finish provides superior surface hardness compared to standard cast-iron rings, extending ring life under high-RPM operation. Compatible with 4.060" bore blocks, this set ensures reliable sealing performance for fuel efficiency and consistent engine behavior. Whether rebuilding a stroker engine or upgrading to performance internals, these rings deliver the precision engineering expected from Speedmaster's motorsports heritage.

Key Features & Benefits

• Plasma Moly Coating: Enhanced wear resistance and durability through advanced plasma moly surface treatment.
• Zero Gap Design: Minimizes blowby and optimizes compression for improved engine performance.
• Precise 4.060" Bore Fit: Engineered for exact fitment in 4.060" bore engine blocks.
• Multi-Ring Configuration: 1.5mm top ring, 1.5mm second ring, and 3mm oil ring for balanced sealing.
• Performance-Grade Quality: Built to high standards for racing and high-RPM applications.

Specifications

Ideal Applications

• High-performance engine rebuilds
• Racing and motorsports applications
• Stroker engine builds
• Performance upgrades for fuel-injected engines