High performance valve spring kit for M8 models with conical single wire (beehive) style springs. Kit includes beehive springs steel top collars bottom collars / seals and valve spring keepers. Compatible with cams providing up to .605" valve lift. 1.535" installed height seat pressure 68 lbs 324 lbs@.605" max RPM 6500. 18-23 Softail 17-23 Touring Trike