I run the same fan for clearence reasons ( 3 core triple pass U.S Radiator) still had to mill 0.25 off the heat sinks of the fan clutch as well as 0.18 off the aluminum pully face to gain 0.50 clearence, ford rotors and calipers on the Alter-K, Chevy adjustable rockers & Milled down long stem Chevy valves..........I believe its referred to as Hot Rodding :toothy10:
If memory serves me correctly that Hayden fan/clutch is 3.5"