I've had 27 GTO's 5 firesbirds & 3 T/A's & none of them ever ran close to that high 230-240 temp. The one that runs the hottest is my 73 GTO with a 461 in it & it runs at about 190. If it were to get any higher I'd be looking at a problem. My 73 when new (bought new) ran at 180 from day one & never got anywhere near the 230 mark. When I changed the original t-stat it had a 180 in it from the factory. The car came with HD cooloing a 400 & auto with the original rear end being a 3:08. If that one ever got close to 200 I'd know it had a problem. The older cab cars should not run any where near 200 ever. They are not designed to do that. I just looked in my parts book & the t-stat that belongs in my car is a 180 deg. NOT a 195 as you have stated. Not all Pontiacs came with a 195 t-stat as you have said. The cars with HD cooloing came with a 180 deg. t-stat from the factory as to keep the temps down so if they did do some hauling it had a chance to go up SLIGHTLY but it was ment to run at 180deg.'s.
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