Evolution and Twin Cam valve springs kits include inner and outer spring assemblies, spring seats, top retainers and valve keeper keys.
HQ-2007 spring sets with titanium top retainers
HQ-2008 spring sets with steel top retainers
HQ-2007
HQ-2008
Seat Pressure
160 lbs @ 1.75”
150 lbs @ 1.8”
Open Pressure
400 lbs @ 1.2”
380 lbs @ 1.8”
Travel -coil bind
1.055”
Shovelhead valve springs kits include inner and outer spring assemblies, spring seats, top retainers and valve keeper keys.
HQ-2001 spring sets with aluminum top retainers
HQ-2002 spring sets with titanium top retainers
HQ-2001
HQ-2002
160 lbs @ 1.5”
350 lbs @ .990”
.890”