Valve Spring

Free Length (Approximately) 44.4 mm (1.747 inch)
Spring Tension (Valve Closed) 333 N @ 39.2 mm (75 lbs. @ 1.54 inch)
Spring Tension (Valve open) 482 N @ 31.40 mm (176 lbs. @ 1.24 inch)
Installed Height 40.18 (1.580 inch)