Piston Ring Set 4.375 Classic 1/16 1/16 3/16

The TOTAL SEAL Piston Ring Set 4.375 Classic 1/16 1/16 3/16 (SKU TOTCR9190-130, MPN CR9190 130) is a file-fit ring kit engineered for classic racing engines requiring precision bore control and dependable sealing under sustained high-RPM conditions. This 4.375-inch bore piston ring set delivers the compression consistency and blow-by control that naturally aspirated and forced-induction race applications demand.

Built from ductile iron with plasma moly facing, this eight-cylinder kit features a 1/16-inch top ring, 1/16-inch second ring, and 3/16-inch oil ring—a proven geometry that balances ring flutter resistance with minimal friction loss. The file-fit design requires hand-honing to final bore dimension, a process that allows engine builders to achieve optimal ring-to-groove clearances and eliminate drag from pre-manufactured sets. Standard tension characteristics mean these rings respond predictably across the typical range of cast-iron and aluminum bore surfaces found in street and competition V8 builds.

This ring set targets experienced engine builders and machine shops performing complete rebuilds, restorations, or competition engine assembly where bore preparation is already in the workflow. The plasma moly facing resists wear and scuffing, extending ring and bore life in high-load applications. TOTAL SEAL's classic racing piston ring sets are favored in hot rodding, vintage racing, and custom engine building communities for their quality control and consistent performance across multiple generations of V8 engines.

File-fit rings demand precision honing equipment and expertise—they are not a drop-in replacement. Verify bore diameter (4.375 inches) and ring groove dimensions match your application before purchase. This kit does not include expander springs or installation hardware; verify all components are present and compatible with your engine block before beginning assembly.