Joe,
You may have better results with the 1000 series Flex-a-lite. The depth is 1-1/4" as opposed to 2" on the 400 series. THis is what I use on my GMC and the fit is still tight, but it clears the radiator with just enough room to replace a fan belt. It moves a lot more air than the stock fan and is still good for 8000 Rpm.
