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Any answers to my actual question will be appreciated, which was not "do I need an oil cooler?".
Will there be a drainback problem with using a high mounted oil cooler? Thanks.

Sorry. The answer to your question ( IMO )is "yes". I will add, although you didn't ask, if you are not running oil temps in excess of 250 degrees for long periods of time, you don't need an oil cooler - IMO.

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