Speedmaster PCE306.1045 4.185" Bore Plasma Moly Piston Ring Set - Zero Gap

The Speedmaster PCE306.1045 is a plasma moly piston ring set engineered for high-performance engine builds and rebuilds. Designed for a 4.185" bore, this ring set features a zero gap configuration that minimizes blowby and optimizes compression retention across the power band. The plasma moly construction provides superior wear resistance and reduced friction compared to cast iron alternatives, making it an ideal choice for racing, street performance, and serious engine applications.

This piston ring set includes the precise ring dimensions specified by the model number: 1/16" top ring, 1/16" second ring, and 3/16" oil ring. The zero gap design eliminates the need for gapping during installation on compatible engine platforms, saving time during assembly and ensuring consistent performance. Plasma moly rings are favored by engine builders for their durability under high RPM and elevated temperatures, delivering extended ring life and improved combustion sealing for maximum horsepower and torque output.

Key Features & Benefits

• Plasma Moly Material: Advanced material construction provides superior wear resistance and reduced friction for extended ring life under high-performance conditions.
• Zero Gap Design: Pre-gapped configuration allows direct installation without additional gapping, streamlining engine assembly.
• 4.185" Bore Fit: Precisely engineered for engines with 4.185" bore diameter to ensure proper ring-to-cylinder wall sealing.
• High-Performance Grade: Optimized for racing, street performance, and rebuilt engines requiring reliable combustion sealing at elevated RPMs.
• Complete Ring Set: Includes top ring (1/16"), second ring (1/16"), and oil ring (3/16") for full piston ring replacement.

Specifications

Ideal Applications

• High-performance and racing engine rebuilds
• Street performance engine builds
• Small-block and mid-block engine restorations
• Engine block reconditioning projects