Thanks for the welcome Ron!
Mine's one of the last Amazons so I'm not sure that it has the one-way valve in the PCV system. In any case it only connects to the air-cleaner so there's no suction applied to the pipe.
I had several MGBs years ago and went to a garage that worked on little else. Over the years I saw quite a variety of breather systems fitted to engines. The mechanic there always advised me to keep it simple and avoid in-line filters, filtered vents, etc, on the grounds that when they get blocked they cause more problems than they ever cured. He was in favour of a heavy-walled rubber tube venting to atmosphere somewhere low-down in the engine bay. Certainly not the most environmentally-friendly arrangement!
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