Piston Ring Set 4.320 5/64 5/64 3/16

The Piston Ring Set 4.320 5/64 5/64 3/16 by Hastings is a precision-engineered ring kit designed for eight-cylinder engines requiring a 4.320-inch bore diameter. Built as a drop-in replacement, this standard-tension piston ring set delivers the compression seal and blow-by control that modern performance and stock rebuild applications demand. Whether you're rebuilding a tired engine or restoring a classic automotive platform, quality piston rings are foundational to cylinder pressure retention and long-term reliability.

Manufactured from steel with a plasma moly coating, this ring set features a three-piece configuration: two compression rings at 5/64-inch thickness and a 3/16-inch oil ring. The plasma moly surface treatment reduces friction, improves heat transfer, and extends ring and cylinder wall life compared to uncoated designs. Standard tension means these rings are engineered for OEM-spec applications where cylinder pressures and thermal loads align with factory parameters, ensuring proper sealing without excessive side load or blow-by at rated RPM and boost levels.

This ring set is ideal for engine rebuilders, performance shops, and enthusiasts performing a full or short-block assembly on eight-cylinder platforms with 4.320-inch bore specifications. Proper ring installation requires precision honing to the correct surface finish and crosshatch angle; neglecting this step will result in poor sealing and premature wear. Confirm bore diameter, deck height, and cylinder wall condition before ordering to ensure compatibility and optimal performance across the ring's service life.