Speedmaster PCE306.1057 4.500" Bore Plasma Moly Piston Ring Set – Zero Gap

The Speedmaster PCE306.1057 is a 4.500" bore piston ring set engineered for high-performance engine builds. Constructed with plasma moly coating, this piston ring set delivers superior wear resistance and durability under demanding operating conditions. The zero gap design ensures precise ring closure and optimal compression sealing, making it ideal for serious engine builders and performance applications requiring reliable, tight-sealing ring sets.

This ring set features a 1.5mm top ring, 1.5mm second ring, and 3mm oil ring configuration—a proven geometry for balanced blow-by control and oil management. The plasma moly surface treatment provides enhanced durability and reduced friction, critical for engines running high RPM or boost. Whether you're rebuilding a competition engine or upgrading a performance platform, this Speedmaster set delivers the precision and material quality expected in professional engine assembly.

Key Features & Benefits

• Plasma Moly Coating: Superior wear and friction resistance for extended ring life and reliable sealing.
• Zero Gap Design: Precision-engineered gap geometry ensures tight compression closure and minimal blow-by.
• 4.500" Bore Size: Engineered for engines with 4.500-inch bore diameter.
• Ring Configuration: 1.5mm top ring, 1.5mm second ring, and 3mm oil ring for balanced performance.
• Performance-Grade Material: Built to withstand high RPM and demanding engine operating conditions.

Specifications

Ideal Applications

• High-performance engine rebuilds and overhauls
• Competition and racing engine assemblies
• Boost and turbo engine builds
• Professional engine machine shop applications