Piston Ring Set 4.000 Bore 1.5 1.5 3.0mm

The Piston Ring Set 4.000 Bore 1.5 1.5 3.0mm by Hastings is an essential rebuild component for engine builders and performance mechanics working with 4-inch bore blocks. This ring set is engineered to restore proper compression sealing, oil control, and ring blow-by management in both stock and modified engines. Whether you're performing a full engine rebuild, restoring a classic engine, or upgrading to a performance block, quality piston rings directly impact power output, fuel efficiency, and long-term engine durability.

This ring set features a precision 4.000-inch bore specification with carefully engineered ring widths of 1.5mm compression rings (top and second), paired with a 3.0mm oil control ring. The dual 1.5mm compression ring design optimizes sealing pressure while minimizing friction losses—a critical balance for both naturally aspirated and forced-induction applications. Hastings rings are manufactured from high-carbon alloy steel with precise tolerances to ensure proper ring gap clearance and consistent bore contact. The 3.0mm oil control ring effectively manages crankcase pressure and prevents excessive oil consumption while maintaining film strength under varying load conditions.

Professionals and serious enthusiasts rely on Hastings rings for comprehensive engine rebuilds, block replacements, and durability-focused modifications. This ring set is compatible with any engine featuring a 4.000-inch bore diameter, making it suitable for small-block and mid-block applications across multiple vehicle platforms. Proper ring installation requires precise ring gap measurement and gapping for your specific bore and climate conditions. Always follow OEM specifications for ring gap clearance during honing and installation to ensure optimal performance and prevent ring sticking or excessive blow-by after reassembly.