[QuickLTD]

I wasnt as concerned with the cd number but rather how the different shapes affect flow. I don't understand why you are having a problem. You still have more open grille area with your blocks than I do with no blocks.. Its a bit of a puzzler. But now you have me glued to this thread LOL.

FYI: The low speed fan relay kicks in at a coolant temp of 215deg and the high speed kicks in around 225. I forget the exact temp on the high speed fans though. They run all the time with the A/C on.