Valve Spring

Compression Pressure @ Height
Test, Intake and Exhaust
680 N @ 30.19 mm
(153 lbs @ 1.18 inch)
Installed, Intake and Exhaust
228 N @ 39.99 mm
(51 lbs @ 1.57 inch)

Service Limit
Pressure Loss @ Specified Height 10% @ 30.09 mm (1.85 inch)