Valve Spring

SPRING TENSION
Valve Closed 271-307 N @ 41.656 mm (61-69 lbs. @ 1.64 inch)
Valve Open 818.5-871.9 N @ 30.89 mm (184-196 lbs. @ 1.216 inch)

Free Length (Approximately) 47.65 mm (1.876 inch)

Inside Diameter 21.0-21.51 mm (0.827-0.847 inch)