Spring Specs:

• 148lb seat pressure at 1.940 installed height / 245lbs. at 1.40 nose pressure on stock cam
• Coil binds 1.3
• Designed for up-to 3,700rpm max
• safe for daily driving#60lb over stock valve springs are really only good for up to 40psi boost & approx 50psi drive pressure
  If you are running higher boost then 40psi or over 3700rpm, you should consider a stronger valve spring set-up than this.
   Lightweight 10 deg chromoly steel retainers that have been designed to mate perfectly with the conical spring shape. This retainer is much lighter in weight and stronger than OEM and other aftermarket retainers because of its reduction in size.