Piston Ring Set 4.280 5/64 5/64 3/16

The Piston Ring Set 4.280 5/64 5/64 3/16 is a precision-engineered component designed for serious engine builders and mechanics who demand OEM-quality performance restoration. Whether you're rebuilding a classic V8, restoring a high-mileage engine block, or pursuing a full bottom-end overhaul, this piston ring set addresses the critical sealing requirements that directly impact compression, oil control, and long-term engine reliability. Sealed Power has engineered this ring set to meet exact bore specifications and gap tolerances, making it an essential choice for anyone committed to doing the job right the first time.

This piston ring set features a 4.280-inch bore diameter with precisely calibrated ring dimensions: two compression rings at 5/64 inch thickness and an oil control ring at 3/16 inch. The dual compression ring design maximizes peak pressure sealing while the thicker oil control ring manages crankcase blow-by and regulates oil film thickness on cylinder walls. Sealed Power's manufacturing process ensures consistent ring face hardness, proper coatings for reduced friction, and exact groove clearances that prevent blow-by and oil consumption. The tighter tolerances in this specification class deliver measurable improvements in cylinder pressure retention and fuel efficiency compared to worn or oversized aftermarket alternatives.

Technicians and engine builders working with small-block and mid-block displacement engines in the 4.25-to-4.30-inch bore range will find this ring set indispensable for complete engine rebuilds and machine work. Proper installation requires careful honing to match ring specifications, correct gap setting to compensate for thermal expansion, and sequential staggering to prevent ring flutter and noise. This piston ring set delivers best results when paired with quality pistons, rod bearings, and fresh gasket sets as part of a comprehensive engine overhaul, ensuring optimal performance and extended engine life. Always consult your engine's technical manual for proper ring gap specifications and installation procedures before commencing work.