small engine bay and small air in take thru the grill .you need to find a way to get more air thru but if the car cools off if you slow down that tells me it water speed if the water is not staying in the rad hows it going to cool? you need to slow it down .hey i been thru all this with my blown 548 in my chevy and my big engines in my gto the 548 and the 572 FUN!!!