Kia Cerato 2009 Service Manual page 59

Valve spring
Standard
Free height : 44.9mm (1.7677in)
Load : 17.5±0.9kg/32.0mm (38.6±2.0lb/1.2598in)
31.0±1.6kg/23.5mm (68.3±3.5lb/0.9252in)
Out of square : Less than 1.5°
Limit
Out of square : 3°
If the loads is not as specified, replace the valve spring.
CAMSHAFT
1. Inspect the cam lobes.
Using a micrometer, measure the cam lobe height.
Cam height
Intake : 44.518 ~ 44.718mm (1.7527 ~ 1.7605in)
Exhaust : 44.418 ~ 44.618mm (1.7487 ~ 1.7566in)
If the cam lobe height is less than specification, replace the camshaft.
2. Inspect the camshaft journal clearance.
(1) Clean the bearing caps and camshaft journals.