Viscous Fan Won't Fit

Thanx for the reply Johnny Dart. I think the fan came off of a slant six Aspen, it's been too long since I picked it up at the boneyard. My reasoning for picking it was if it had enough room on a slant six it should fit my v/8 conversion. Fan is 18-1/4" diameter, the same diameter I think for the 4120758, so fans should be physically very close in dimensions, pitch from pics looks to be the same, but are in fact different part numbers so something has got to be different. I don't think any clutch fan unless notched will fit my car, might be a 73-up thing.

Thanx again for your replies, I love that sublime green color, my wife keeps suggesting that color when I go for a repaint. Got any pictures posted of your dart on here?