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i thought there was a thread on this a few years ago... i think the jist of it was generally if there is a top and bottom opening, close off the top opening first
i wouldnt worry about thermo probes personally, but i didnt block my grill until i had a scan gauge. i think engine coolant temp is the primary concern.
i'm running a compete block, but behind my bumper there is a gap, and the factory airdam at the bottom of the radiator scoops up all the air my car needs under any conditions
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