chevy valve springs?

http://www.hughesengines.com/Index/...&submit=Go&searchmode=partnumber&partid=10280

HUG 1110

VALVE SPRING SINGLE W/ DAMPER

120# @ 1.660' INSTALLED 310# @ .550' LIFT

$5.90






Installed Height/Pressure: 1.660"--120#
Pressure @ .450" lift: 280#
Pressure @ .500" lift: 300#
Pressure @ .550" lift: 310#
Coil Bind: .620" lift
Outer Spring ID/OD: 1.033"/1.440"
Type of Spring:Single w/ damper