Piston Ring Set 4.350 5/64 5/64 3/16

The Piston Ring Set 4.350 5/64 5/64 3/16 by Hastings is a precision engine component engineered for serious engine builders and mechanics performing top-end rebuilds on eight-cylinder gasoline engines. This drop-in piston ring kit restores lost compression and blow-by sealing when OEM rings have worn beyond acceptable limits, making it essential for any full-bore engine overhaul or performance restoration work. Available for sale as a complete four-cylinder set, it addresses the most common bore size found in mid-range V8 performance and street applications.

This ring set features a 4.350-inch bore diameter with a precisely calculated thickness breakdown: two compression rings at 5/64 inches each, plus a 3/16-inch oil control ring. The plasma-moly coating on the compression rings provides superior wear resistance and faster ring seat-in, reducing blow-by during initial engine break-in while maintaining long-term durability. Standard tension design ensures reliable sealing pressure without excessive side load on cylinder walls—a critical balance that prevents both compression loss and accelerated piston skirt wear. Each ring is manufactured to tight OEM tolerances, guaranteeing consistent gap clearance and uniform load distribution across the ring pack.

Mechanics and engine builders working with street, strip, or mild racing eight-cylinder platforms benefit most from this Hastings ring set, particularly when rebuilding small-block or mid-block Chevrolet, Ford, and Mopar engines in the 4.3- to 4.4-inch bore range. Proper installation requires correctly sized ring gaps, verified piston-to-wall clearance, and careful cylinder wall honing to ensure the plasma-moly coating achieves optimal seat-in. This is a drop-in replacement that requires no special machining or modifications when installed in stock or professionally bored blocks, making it the go-to choice for cost-effective, reliable engine assembly.