How can a 273 four barrel carb make a car run "hot"? A smaller carb doesn't run "leaner" than a bigger carb. Any carb is constructed to provide the proper air/fuel ratio based on air flow. Based on some of the above "logic" that means a two barrel carb will run "hotter". How silly this thread has become! The best advice is to buy the now reasonably priced IR pistol that measures surface temperatures instantaneously. Point it at the thermostat housing, radiator hoses, top of radiator tank, lower radiator tank, and exhaust manifolds. In less than a minute you will have a number of data points to evaluate engine heat and coolant temperatures. Then report back to us.
