an engine doesnt just need more heat, it needs a very specific heat range. anything you can do to get the cooling system around 200-210 and keep it there is going to help the engine run well. Having too much heat will negatively affect performance well. In a perfect world, I think it would be nice to have the engine bay slightly sealed, with some fresh air flow to reduce moisture, the radiator/ac/oil coolers have their own entirely seperate in and out air flow, and the intake have a variable fresh outside air to warm behind the radiator air system.
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