280 Models
The system includes a sealed oil filler cap, vent jet in camshaft cover, and a hose connecting vent jet to air cleaner.
The engine blow-by gases and crankcase vapors are routed from the cylinder head cover to the idle air duct in the intake manifold via the vent jet. From this point gases flow through the intake manifold to the combustion chamber.
In the lower and partial load range, intake manifold vacuum draws clean air from the air filter through the air hose connected to the cylinder head cover, picking up blow-by gases from the engine along the way.