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on single cam engine its inlet manifold side just behind cam gear rear cover bolted into cam box cover twin cam its behind cams in middle front of engine in centre of rocker cover remove cover over h.t.leads this one is eazy but tricky due to bolt inside cam belt cover
I think it is in the valve cover. see illustrations from shop manual.
Positive Crankcase Ventilation System
The Positive Crankcase Ventilation (PCV) System (Figure 132)cycles crankcase gases back through the engine where they are burned. The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase. The PCV valve should be mounted in a vertical position. On some applications, the PCV system is connected to the evaporative emission system (refer to the VECI decal). located on the underside of the hood or on the radiator cooling fan shroud.
crankcase ventilation tube
Remove the positive crankcase vent (PCV) hose from the clips.