The Speedmaster PCE306.1062 is a Plasma Moly piston ring set designed for a 4.600-inch bore with a 1.5mm/1.5mm/3mm ring width configuration. The plasma moly face coating promotes faster break-in, reduces friction, and helps maintain a reliable seal under demanding engine conditions — making this set a strong choice for performance and racing engine builds.
The zero-gap design provides a precise fit that minimizes blow-by and maximizes cylinder pressure retention right out of the box. Sold as a complete set, these rings are ideal for builders looking for a proven ring package to complement a performance engine assembly centered around a 4.600-inch bore diameter.