99233-4 Lower valve spring collar set. +.030"

For engine builders looking for a bit more room, these Manley lower valve spring collars feature a low profile that provides an additional .030 inches of spring travel. This is a crucial modification when installing high-lift cams in 1948 to 1979 Big Twin engines. Sold as a set of four, these collars are made from heat-treated chromoly and finished in black oxide. They are compatible with OEM, Manley, and most aftermarket valve springs. By increasing the available travel, you reduce the risk of coil bind, ensuring your valve train remains reliable even when you're pushing the performance envelope on a Pan or Shovel.