Piston Ring Set 4.045 043 043 3.0mm

The Piston Ring Set 4.045 043 043 3.0mm from MAHLE PISTONS is an OEM-quality engine rebuild component designed for high-performance and street applications requiring precision piston ring replacement. This ring set serves mechanics and engine builders who demand reliability during top-end rebuilds, restorations, or performance upgrades. MAHLE's piston rings maintain tight tolerances and proper gas sealing, making them essential for restoring compression, reducing blowby, and extending engine longevity after years of wear.

This ring set features a 4.045-inch bore diameter with dual compression rings measuring 043 inches and a 3.0mm oil control ring, engineered to handle combustion pressures while maintaining optimal oil distribution within the cylinder. The 043-043-3.0mm configuration delivers superior ring-to-groove fit and consistent tension across the piston lands, reducing friction and minimizing blow-by gases that compromise efficiency. MAHLE's manufacturing process ensures consistent chrome or molybdenum facing (depending on application), providing wear resistance and extended service life in both stock and modified engines.

This piston ring set is ideal for small-block and mid-displacement engines commonly found in street cars, classic vehicles, and entry-level performance builds where 4.045-inch bore specifications apply. Installation requires proper ring gap setting and honing to manufacturer specifications; most builders gap compression rings between 0.009–0.015 inches depending on fuel type and boost levels. Compatibility depends on your engine's exact bore and piston specifications, so verify your block's current bore diameter and piston model before purchase to ensure correct fit and optimal sealing performance.