Piston Ring Set 4.065 043 043 3.0mm

The Piston Ring Set 4.065 043 043 3.0mm by MAHLE PISTONS is engineered for serious engine builders and mechanics performing high-precision rebuild work on four-cylinder and V-engine platforms. This OEM-quality ring set is designed to restore proper compression sealing, oil control, and ring-to-bore fit in engines requiring 4.065-inch bore diameter pistons. Whether you're restoring a classic performance engine, rebuilding after a catastrophic failure, or upgrading a modified platform, this MAHLE ring set delivers the dimensional accuracy and material consistency that separate professional-grade components from inferior aftermarket alternatives.

The 043 043 3.0mm specification denotes compression ring thickness (top and second rings at 0.043 inches) and oil-control ring width (3.0mm), which are critical measurements for achieving proper ring gap and blow-by control during combustion cycles. MAHLE's precision manufacturing ensures consistent cross-section dimensions and superior surface finish that reduces friction and extends ring life in both naturally aspirated and turbocharged applications. The 4.065-inch bore sizing provides tight tolerances required for modern piston-to-wall clearances, minimizing slap noise and maximizing sealing efficiency across the RPM range.

Each ring is individually inspected to meet strict dimensional standards before packaging, guaranteeing compatibility with correctly machined cylinder bores. Mechanics and engine builders targeting 4.065-inch bore will find this 3-ring set (2 compression rings and 1 oil-control ring) essential for achieving optimal performance in their engine rebuild projects. This product is compatible with both cast-iron and aluminum cylinders, making it a versatile choice for various engine applications.