Valves and Cylinder Head

- Check for plugged oil drain back holes.
- Check for missing or damaged valve stem seals.
- Check for a plugged oil metering orifice in the cylinder head oil reservoir.

If insufficient oiling is suspected, check the oil passages for blockage, then accelerate the engine to 1200 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the roller followers oil holes so that the valve tips and the camshaft roller followers are well oiled. With the valve covers off, some oil splash may overshoot the camshaft roller followers.