Premium OEM-Quality Piston Rings – Set of Hastings Standard Size Moly Replacement rings for 1999-2015 Chevy LC9, LS4 4.8 5.3L Ring set is complete set for one engine. Fitment for the following engines: 4.8L 1999-2015 VINs A,C,V,O,7,4 5.3L 1999-2013 LC9, LS4 VINs 0,3,4,B,C,J,L,M,P,T,Z 3.779" 96mm Bore- 1.5mm 1.5mm 3.0mm ring configuration. Standard Bore Size Compatibility – Specifically designed for stock bore LS pistons, providing a precise fit without the need for additional machining. The Hastings 2M4978 engine piston ring is made of the following materials: 1st oil ring: Steel rail and stainless expansion 2nd ring: Grey iron Top ring: Steel Designed for LS Applications – Engineered for 5.3L and 4.8L LS-based engines, including LM7, L59, LS4, LY5, LMG, LMF, LH6, LC9, and L33. Ideal for Rebuilds and Performance Upgrades – Suitable for daily drivers, work trucks, and performance applications requiring high-quality piston rings.