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direction into and out of the radiator doesn't matter, I even had mine backwards. not having a fan shroud, those small motor fans ( I couldn't get enough airflow with the same units) and having both pushers and pullers (pushers are basically a restriction) are the issues. I spent a ton of time figuring out the best way to keep a swap cool. bigger aluminum rad with a full shroud and dual spals with the big motors was the only way that worked perfect. any other way it would be fine for a while, but eventually heat soak to the point the system could not keep up
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