the viz valves are variable inlet valves which sit inside the inlet manifold and, so i believe, alter the airflow within the manifold depending on load etc. They are driven by two motors controlled by a control unit (ECU?). the inlet manifold has a feed from an oil breather. this oil clogs up the manifold and motors and yhen the sytem stops working or the motors burn out.
I still have two motors which acme orf my KV6 if that is wot yu need.