Valve Spring

Compression Pressure @ Height
Test, Intake and Exhaust
396.0 N @ 25.5 mm
(89.0 lbs @ 1.0 inch)
Installed, Intake and Exhaust
177.0 N @ 34.5 mm
(39.8 lbs @ 1.36 inch)

Service Limit
Pressure Loss @ Specified Height 10% @ Specified Height