Upgrade your engine's performance with the Mahle RINGS PISTON 4.030 BORE SET, designed to enhance efficiency and power output. This high-quality piston ring set is perfect for those seeking to optimize their engine's compression and reduce oil consumption. Precision-engineered for a 4.030 in. bore, ensuring a perfect fit for superior sealing and performance. Includes all necessary rings: top, second, and oil rings, crafted from durable steel and stainless steel for enhanced longevity. Standard oil ring tension provides reliable oil control, helping to minimize oil consumption and maximize engine efficiency. Top ring features HV385 Thermal facing material, designed to withstand high temperatures and reduce wear over time. File fit capability allows for customization, enabling you to achieve optimal ring gap for your specific application. This set includes 8 piston rings, with thicknesses of 1.0mm for the top and second rings, and 2.0mm for the oil ring, ensuring comprehensive coverage for your 8-cylinder engine. Choose Mahle for reliability and performance that stands the test of time.