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<<  My thinking is that if I can get things right on the ground, I'll have less of a problem in the air regarding sealing the baffling >>

It has been said a thousand times, and worth repeating that the break-in time spent on the ground should be kept to a minimum, consistant with leak checks and to ensure max performance before commiting oneself to flight.  Ground running an engine without proper equipment is a sure way to damage that "new" engine.  Please don't get caught up in seeking absolute numbers for ground temp's.  Ensure the baffling is tight, and that every molicule of air entering
the front is forced to cool the engine and is not wasted through spaces between the baffling and the engine or cowl.  If sealed correctly and with a vengeance, it will provide adequate cooling in flight, but don't forget that the temperatures will be elevated until the engine "breaks-in" and life becomes good.  Also:  Keep thine airspeed up and the temps will stay acceptable.  (No poet here)...

Mike DeHate

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Please send your photos and drawings to marvkaye@olsusa.com.