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Message: <blockquote data-quote="shovel" data-source="post: 1589382" data-attributes="member: 29855">It's probably worth reminding ourselves that conservation of energy isn't just a good idea - it's the law.   An idling 500 horsepower SBF and an idling 200 horsepower SBF should produce almost the same amount of heat because they both have roughly the same amount of friction to overcome in order to spin 750 rpm and turn the accessories.    For the same reason a 500 horsepower Mustang and a stock Mustang should produce the same amount of heat cruising at any given speed because the rolling and air resistance of the car itself is about the same. Some parts add up, like bigger valves are probably heavier (slightly more work to slam them open),  high rpm springs require more work to push open, wider tires push more air out of the way and have higher rolling resistance - on the other hand a free flowing exhaust should permit some improvement in evacuation of heat energy from under the hood.. but lowering a car means there's less room for the hot air to get out under the car.  Having said all that,  hundreds of thousands of people have done all sorts of things to modify their Mustangs and most of them don't have heat problems and don't need to run special coolant or undertake other bizarre measures to deal with it.   Since you said you're using the stock sensor,  is it possible the stock sensor is calibrated differently from the Holley one and maybe your temps are fine just being displayed wrong?</blockquote>