For what it’s worth, my 400 in my 77 Trans Am (8.8:1) had a 160 in it from the time I bought it 11 years ago until last week. It wasn’t until a few weeks ago, when I installed a temporary mechanical gauge, that I realized the engine was only running 160ish in town and 170ish or under on the highway. I swapped in a 180 last week and it runs right around 180 in town and 190ish on the highway.
I did test the gauge with a pot of boiling water and compared it against crossover temps with infrared thermometer.
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