Best way to balance a flex fan? easy, bolt on a thermal clutch fan that doesn`t stay engauged all the time and rob power like a flex fan does and also doesn`t make a sound under the hood like a tornado.
You can try useing thin washers and a small level and when the level reads even all the way around you should have a balanced fan. There will always be some bend and flex but it will look better then having flap all over the place.
with 4 bolts and a 1" spacer.The mounting holes on the flexfan are not round,they're oblong.Which means there is room for adjustment.I was just wondering how others balanced theirs.Its no big deal.....i'll just fiddle with it until its right.My spacer is too small anyways. bm