Piston Ring Set 4.030 1.5 1.5 4.0mm

The Piston Ring Set 4.030 1.5 1.5 4.0mm by HASTINGS is a precision-engineered component designed for high-performance engine rebuilds and serious modifications where oversized pistons demand matched ring sets. This ring set serves engine builders, mechanics, and enthusiasts who are stepping up displacement through boring operations or installing forged piston kits in performance applications. When you bore an engine block to 4.030 inches, stock ring sets become obsolete—you need a matched set that seals properly at the larger bore diameter to maintain compression, prevent blowby, and ensure reliable ring-to-groove clearance for decades of operation.

The ring configuration of 1.5mm top ring, 1.5mm second ring, and 4.0mm oil ring thickness represents a modern compromise between sealing efficiency and reduced friction—critical for both street performance and competition engines. HASTINGS rings are manufactured to exacting tolerances with premium iron alloy materials that resist wear, maintain elastic tension across thousands of heat cycles, and provide consistent sealing from idle to peak boost or RPM. The 4.0mm oil ring thickness ensures effective oil control and return to the crankcase, preventing excessive oil consumption while the dual compression rings work together to manage blow-by gases and maintain cylinder pressure under varying loads.

This piston ring set is essential for anyone boring a small-block or big-block engine to 4.030 inches, whether building a street cruiser, drag racer, or naturally aspirated performance platform. Installation requires proper ring end-gap filing to match your specific engine displacement and compression ratio, professional ring installation using a compressor tool, and careful attention to ring orientation and groove cleanliness during assembly. Verify your exact bore diameter and piston specifications before ordering, as piston ring sets are precision-matched components with zero tolerance for size deviation.