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Generally I have found on aluminum blocks that when you get a leak somewhere (unless you're really paranoid about topping off coolant level) you start the head gasket failure routine.
The warpage of heads is a heating then rapid cooling process which mimics a stress relieving procedure which machine shops do between "billet" machining steps.
Air bubbles in the coolant do not promote even cooling.
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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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