If memory serves me correct, I believe that is way too close. I have a stock declutching fan and stock radiator. I have 4.15" from fan clutch face to the back side of a 4 core radiator.
I digress..was doing other stuff and my ADD kicked in. the electric fan spacing is fine.
Compensating for the clutch, I say the fan is appx 5.25" away from the core.
If you are ONLY using an electric fan, as I did with aluminum radiator, that will not work. You will have to supplement the puller/pusher electric with a flex fan/shroud.
I ran a stock 7 blade belt driven flex fan and wasn't enough. I then went to a puller electric in front of the radiator and solved the problem.
I might suggest a dual fan setup. would cover more area at a higher speed/air volume.
