Cylinder Head Assembly: Description and Operation

DESCRIPTION
The cylinder heads (6049) are aluminum. They house the single overhead camshafts (6250) (OHC) and there are two valves per cylinder.


OIL PASSAGES
The left cylinder head is fed from a drilling into the lateral supply passage feeding the main gallery at the front of the cylinder block.
The right cylinder head is fed from a drilling into the rear of the main gallery.

OIL PRESSURE
Main gallery pressure is reduced as it enters the cylinder head galleries through the use of fixed serviceable orifices located at the upper part of the feed passages. This reduced pressure in the cylinder head galleries feeds the following:
- camshaft journals.
- valve tappets (6500).
- hydraulic timing chain tensioners (6L266).
- cam lobes and rocker arms (6564) (lubricated by splash created through valve train operation).