Originally posted by Ron Golden
When does it get hot? Sitting still? On the highway at speed?
Make sure the fan if blowing back through the radiator and not blowing from the engine side. The fan will run both directions depending on how's it's wired.

If your using an electric fan how are you using a fan clutch?

As far as the engine being new and tight: Thats BS. If thats the case they didn't build it right. A newly rebuilt engine should have all the clearances right when they rebuild it.
It overheats sitting still and the temp may stay at about 210-220 degrees while driving. The electric fan is mounted to the front of the radiator and the fan on the motor is still working. Yes, the electric fan does it does blow through the radiator.

Not sure if this has anything to do with it but the mechanic says it needs a vacuum advance.