Valve Spring

Valve springs compression pressure (N [Lb] @ spec length)
valve open (without damper) 1000 N (224 lbs) @ 29.2 mm (1.16 inch)
valve closed (without damper) 350 N (79 lbs) @ 40.7 mm (1.62 inch)
assembled height 40.7 mm (1.62 inch)
service limit 10% Force Loss @ Specified Height