Piston Ring Set 4.040 1.2 1.2 3.0mm

The Piston Ring Set 4.040 1.2 1.2 3.0mm by HASTINGS is an OEM-grade replacement ring set designed for engines with a 4.040-inch bore diameter. This set is particularly useful for engine rebuilds where maintaining original bore diameter is critical, making it suitable for both stock and lightly modified platforms.

This four-piece ring set features a top compression ring measuring 1.2mm, a second compression ring also at 1.2mm, and a 3.0mm oil control ring. These dimensions ensure optimal radial pressure against cylinder walls and effective oil management. The thinner compression ring profile helps reduce friction and improves ring-to-wall contact consistency, while the oil ring thickness aids in preventing excess oil consumption.

Builders working with 4.040-inch bore blocks—common in small-block Chevrolet, Ford, and Chrysler applications—will find this ring set beneficial for reliable assembly. Proper installation is crucial for achieving the best performance and longevity from the engine. Hastings piston rings are known for their tight tolerances and effective design, making them a trusted choice among engine builders.