1375 Upper valve spring collar set. Chromoly

For those running larger diameter valve springs, these JIMS upper valve spring collars are the ideal choice. Machined from Chromoly, they are compatible with spring diameters ranging from 1.500 inches to 1.550 inches. Like the smaller version, these feature a 10-degree angle for a proper fit on Harley-Davidson heads and work with double springs including dampers. They fit all valve stem sizes and are designed for 1984 to 2004 Big Twins, Twin Cam B models, and 1986 to 2003 XL Sportsters. Sold as a set of four, these collars are a significant upgrade over stock components, providing the strength and precision required for serious performance engine builds where valvetrain stability is paramount.