hey can anybody tell me what mods i will have to make to my radiator in order to get an ef fan into my eb2.

physically itll pretty much bolt in (have fun getting the clutch fan off ), the tricky part is doing the wiring youcanrun a EL computer and let that control it *alot of stuffing around*, or just go to jaycar or some little electronics store and pickup a thermo fan temp controller, itll turn on/off your fans at certain temps that you can adjust.

It will bolt straight in if you have the late model radiator. Earlier models didn't have the captive nuts built into the top of each tank that you will require for mounting the EF fans.

If you have replaced your radiator in the passed 5 years or so then chances are you have the new radiator model, I don't believe the old one is still made.

Is it much drama to convert to EL 3 relay setup from EF 4?

My fans have been stuffing up with A/C on (turning off)