Speedmaster PCE306.1027 4.020" Bore Plasma Moly Piston Ring Set - Zero Gap

The Speedmaster PCE306.1027 is a 4.020" bore plasma moly piston ring set engineered for high-performance engine applications. This zero gap ring set features plasma moly construction, a premium material choice that provides enhanced durability, improved heat dissipation, and superior wear resistance compared to standard iron rings. The ring set is sized for 4.020" bore engines and includes the critical top (1/16"), second (1/16"), and oil control (1/8") ring specifications needed for proper engine sealing and oil management.

Ideal for engine builders, hot rodders, and serious enthusiasts rebuilding small-block and performance engines, this piston ring set delivers the precision fit and material quality required for reliable operation under demanding conditions. The plasma moly composition makes these rings particularly well-suited for high-revving engines, forced induction builds, and applications where maximum ring durability and seal integrity are essential. The zero gap design minimizes blow-by and optimizes compression, supporting both street and competition performance builds.

Key Features & Benefits

• Plasma Moly Material: Premium plasma moly construction provides superior wear resistance, heat dissipation, and durability compared to standard iron rings.
• Zero Gap Design: Minimizes blow-by and optimizes compression seal for improved engine performance and efficiency.
• 4.020" Bore Sizing: Precision engineered for 4.020" bore engines with correct top (1/16"), second (1/16"), and oil control (1/8") ring dimensions.
• High-Performance Grade: Built to withstand the demands of rebuilt engines, hot rod applications, and high-revving performance builds.

Specifications

Ideal Applications

• Small-block engine rebuilds and restorations
• High-performance and hot rod engine builds
• Competition and racing engine applications
• Forced induction and turbo engine builds