on an aircooled clean air engine, the thermostats flappers were known to stick shut and trash an engine. It's really hard to find one with working parts. It is also difficult to say if the directed air favored anything since they closed sideways. The best ones came off the early single ports and were installed on the cooling fan input
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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