Speedmaster PCE306.1031 4.000" Bore Plasma Moly Piston Ring Set - Zero Gap

The Speedmaster PCE306.1031 is a precision piston ring set engineered for 4.000" bore engines, featuring plasma moly construction for enhanced durability and heat resistance. This zero gap design minimizes compression loss and blow-by, delivering improved ring seal and combustion efficiency. The ring set comprises a 1/16" top ring, 1/16" second ring, and 3/16" oil control ring, making it ideal for high-performance and rebuilding applications where reliable compression and oil control are critical.

Plasma moly technology provides superior wear resistance and longevity compared to standard cast iron rings, particularly in high-rpm and high-temperature operating conditions. The zero gap configuration is precision-manufactured to maintain consistent bore contact, reducing friction and optimizing power transfer. This ring set is designed for engine builders and enthusiasts seeking OEM-quality performance in small-block applications. Compatible with engines requiring 4.000" bore specifications, it delivers the sealing integrity needed for street, strip, and competition use.

Key Features & Benefits

• Plasma Moly Construction: Enhanced wear and heat resistance for demanding engine applications.
• Zero Gap Design: Precision-fitted rings minimize compression loss and blow-by.
• 4.000" Bore Specification: Engineered for exact 4.000" bore engines.
• Complete Ring Set: Includes 1/16" top, 1/16" second, and 3/16" oil control rings.
• High-Performance Rated: Suitable for street, strip, and high-rpm applications.

Specifications

Ideal Applications

• Engine rebuilding and overhaul projects
• High-performance small-block engine builds
• Street and strip racing applications
• Competition engine assembly