[J Persons]

I didn't see it mentioned, but if you don't have a radiator shroud, install one. Also insure that the incoming air can't divert around the radiator, but has to go through it. Check the sides as well as the top of the radiator, especially on an angled radiator. If the top area isn't sealed, air will spill over the top between the body and the rad, instead of going through the radiator. John