Dual Interference Valve Springs
Steel or Titanium Retainers Option
Rated up to 10,000 RPM with the proper engine setup
Adds a margin of safety against over-revving or a possible mis-downshift
Designed for maximum reliability
Capable of handling both mild and aggressive camshafts
Compatible with all performance camshafts
Shot-peened for stress relief
Dual-interference Alloy* springs to control harmonics across the rev range and reduce damage from valve-drop if a spring fails.
All made in USA
*Alloy is a metal often used for highly stressed structural parts (such as aircraft landing gear) and also offers resistance to thermal fatigue.
Great when added to camshaft set From Ronald Woodbeck of napa, California on 11/16/2011.
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