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 designed for eight-cylinder engines requiring a 4.380-inch bore diameter. This drop-in piston ring set is engineered for builders and engine rebuilders who demand reliable compression and oil control in high-performance or stock rebuild applications. Whether you're restoring a classic engine or assembling a performance rebuild, this ring set provides the critical seal needed between the piston and cylinder wall to maintain compression and engine longevity.

Manufactured from high-quality steel with a plasma moly coating, the Piston Ring Set 4.380 5/64 5/64 3/16 features three ring positions per piston: two compression rings (each 5/64 inch thick) and one oil control ring (3/16 inch thick). The plasma moly surface treatment significantly reduces wear rates and extends ring life under sustained combustion pressures, while the standard tension specification ensures optimal sealing without excessive friction. The 4.380-inch bore sizing is a common specification across many classic and modern eight-cylinder engine platforms, making this kit a direct replacement for factory or previous rebuilds requiring standardized ring dimensions.

Engine rebuilders, machine shops, and serious DIY enthusiasts benefit most from this complete eight-cylinder piston ring set. Installation is straightforward for anyone performing a piston or complete engine rebuild—the ring set drops directly into prepared cylinders with no custom fitting required. Verify your engine's bore diameter and cylinder count before purchase to ensure compatibility; this set is specifically engineered for 4.380-inch bores and will not fit smaller or larger displacement variants. Proper ring gap setting during installation is essential for optimal performance and engine durability.