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Valve Springs

Evo and Twin Cam valve springs kits include inner and outer spring assemblies, spring seats, top retainers and valve keeper keys for use 5/16" stem valves

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"

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

Seat Pressure

160 lbs @ 1.5"

160 lbs @ 1.5"

Open Pressure

350 lbs @ .990"

350 lbs @ .990"

Travel -coil bind

.890"

.890"