Speedmaster PCE306.1055 Piston Ring Set Bore Plasma Moly Zero Gap - 4.330 1.5-1.5-3mm

The Speedmaster PCE306.1055 piston ring set is engineered for high-performance engines with a 4.330-inch bore diameter. This zero-gap ring set features a 1.5mm-1.5mm-3mm configuration designed to withstand the demanding conditions of racing and aggressive street applications while delivering exceptional durability.

Key Features:

• Plasma-moly coated top rings with barrel-shaped ductile iron construction for superior wear resistance
• Zero-gap design minimizes blow-by and maximizes cylinder sealing
• Ductile iron top rings maintain optimal sealing even as the piston rocks in the bore
• Tapered secondary compression rings seal against the oil control ring's upper surface for enhanced oil control
• 3-piece oil ring assembly with stainless steel expanders provides consistent tension without power loss
• 1.5mm top compression ring, 1.5mm second compression ring, 3mm oil control ring

Ideal for performance rebuilds and racing applications where maximum ring seal and minimal friction are critical. The plasma-moly coating reduces friction and extends ring life, while the precision-engineered design ensures proper sealing throughout the power band.