first of all, this is how i proved this. `55, .060 over 327, stock radiator, in the v-8 position, flex-a-lite fan for all these tests. first with WEIAND "HIGH-FLO TWISTED SNOUT" pump. 195 stat, 180 stat, 165 stat, Stewart high flow 180 stat. would heat up very fast idling in the driveway with all of these. then driving, it would take forever to cool back down, and never below about 190. now granted, these cylinder walls are pretty thin. so, next, stock 350 rebuilt pump from car quest, off comes the "high-flo" pump. now, next test, stewart high-flow stat. the same results, HOWEVER took less time to heat up in the driveway, but once heated up, [all these "heated up" temps were within 5 degrees of 220], then a substantially shorter time to cool down when driving. next the 195, 180, 165 stat. with the stock radiator, stock pump, stock 180 stat, idled forever at 175/180 IN MY GARAGE. so, a few years later, exact same set-up in my `57, however, it`s a 350, .030 over, and an aluminum, direct replacement radiator, and the same thing, however, it does hit about 195 in the heat of the summer. i was berated big time, over this on the other forum. i took it, however 1 or 2 guys agreed. so, what do you think of "SMOKEY YUNICK"? IMO, the best damn mechanic in "the best damn garage in town"! recognize that line? anyway, stumbled on smokey yunick`s "power secrets" magazine. quote from him printed in his book, "if you spin the pump too fast, the coolant will be circulated through the engine too quickly. when this happens the coolant doesn`t remain in the engine long enough to efficiently absorb heat and carry it away to the radiator." adding to this, "turning the pump too fast can also cause the pump impeller to whip the coolant into an aerated froth, and putting alot of bubbles in the coolant will significantly decrease the ability of the coolant to absorb heat. then adding, "you should not have to turn the pump faster than 70-75% of crank speed".adding to this, when the heated coolant flows to/in the radiator, it`s not there long enough to cool. so, NOT to open a can of worms, i even checked about posting this subject with another, very respected member here because i was a bit hesitant. but, here it is. "something to back this up", ya always hear from guys, well, that`s my experience. thanks for listening!,,,,,,,,,,happy thanksgiving!