Piston Ring Set 4.380 5/64 5/64 3/16

The Piston Ring Set 4.380 5/64 5/64 3/16 is a precision-engineered complete ring kit specifically designed for eight-cylinder engines that require a 4.380-inch bore diameter. This kit is ideal for builders and engine rebuilders who demand reliable compression and oil control in both high-performance and stock rebuild applications.

Manufactured from high-quality steel with a plasma moly coating, this piston ring set features two compression rings (each 5/64 inch thick) and one oil control ring (3/16 inch thick) per piston. The plasma moly surface treatment significantly reduces wear rates and extends ring life under sustained combustion pressures, while the tension specification is designed to ensure optimal sealing without excessive friction.

Engine rebuilders, machine shops, and serious DIY enthusiasts will benefit most from this complete eight-cylinder piston ring set. Its compatibility with many classic and modern eight-cylinder engine platforms makes it a direct replacement for factory or previous rebuilds requiring standardized ring dimensions. Installation is straightforward for anyone performing a piston or complete engine rebuild, as the ring set is designed to drop directly into prepared cylinders.