heres what I have been told ..the optimal distance for the fan to radiator clearance is 3/4".
That said, why not machine down your 2" spacer to achieve the required clearance?...may be an aption in your situation if 2" is too much?, on my 52 I took a 1/4" off on a mill to get my distance set at 3/4" and I have never had any overheat issues.
just my 2 pennies.
Tim
