Very high. 140C = 284 F. I'm surprised that the car will even run for long at that temp without blowing a hose, gasket, etc. And yes that would thin the oil and lower the oil pressure. And yes, it is at least partly due to that ultra high coolant temp.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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