I have a griffin nascar 31"x19"aluminum radiator with 1 and 1/4 inch cores (2 row) and I use the ramchargers fan also... it was the only fan I was able to get to fit with my superchargers seperately driven crank pulley. That pulley is huge and my black magic fan wouldn't fit for anything. I even hammer and drilled and sawzalled and nothing I tried would make that damn POS fit. By the way, those who refer to the Black Magic fan as a Black Tragic are so right. That thing wouldn't cool my car and I have a SWEET cooling system on a 488rwhp motor and jet hot coated headers (dropped my underhood temps by 40 degrees according to my thermistors mounted under the bay in various locations). The car went up to 250 degrees IDLING in the shade on a 90 degree day with the POS Black Tragic fan... I hate that fan. It only works if you car is under 300rwhp.. It works fine on my daily driver, but on my track/street car it will kill your engine...