Manley Replacement Piston Ring Kit 4 PackManley Piston Rings provide minimal blowby and increased horsepower while maintaining cooler, cleaner oil resulting in longer engine life. Manley ring sets feature a ductile iron plasma moly top ring, a conventional reverse twist cast iron second ring, and a 3 piece standard tension oil ring. Select correct ring size from drop down box. Ring Set Part # Suits Piston # Bore Size (mm) Over Size 46920DT 4 615000CE 4 92. 00 STD 46920DT 4 620000CE 4 92. 00