My blower has been making a bad squeaking noise so I bought a new motor without a new fan planing on reusing my old fan but I get the old one out and there isn't a nut holding the fan to the shaft? My factory GM manual says to remove the nut and remove fan, the new motor has a nut on the shaft to hold the fan on, do I have a motor with a non replaceable fan? I tried locking up the motor and twisting but it won't budge. And is this a high performance fan, note the Hurst symbol!!!

 

You will have to get a bolt on fan cage from the parts
store or a salvage yard(lots of '80s-90s gm uses the
same fan),even if you get the press-on fan off it still
won't fit the bolt-on type motor properly.
The "H"emblem is "harrison radiator"-does look a lot
like the Hurst "H" LOL