Couple more thoughts:
Did it do this before? What was the temp. gauge behavior before the layup?
Just to be sure the temp. gauge is not lying to you, verify the actual temps with an IR laser thermometer.
We are not as familiar with the cooling system topography (outside of the engine itself) in the LT; might there be an air bubble trapped somewhere?
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1985 744 gle d24t
1985 745 gle d24t
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