These springs are the only true drop-in performance springs for the 5.0L 4-valve engine.
* No added cost for special retainers, spring cups, or seals
* No machining necessary
* Designed to work with all factory hardware
* Give added spring pressure needed for most aftermarket camshafts
* Eliminate valve float to reduce the risk of any engine damage in high lift or RPM applications
Install Height: 1.575
Max. Valve Spring Lift: .580
Spring Pressure Closed: 70lbs
Spring Pressure Open: 190
Coil Bind: .950
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