by slowflapper Mon Sep 20, 2010 9:13 amEveryone loves heat management threads right 
I wanted to replace the stock 16" 5 bladed mechanical fan on my 273 with something that would move more air. I priced NOS/Used 7 bladed fans for these engines and they were everywhere from $40 to $80 and more than I wanted to spend. I finally settled in on a Summit Racing 17" 6-bladed "heavy duty/high volume" universal fan for $27.
The blade pitch is steep so it moves a heap of air at idle and low speed when you really need it. I also have an electric fan installed and I'll include some details on that as well.
Note that in a 65" Dodge with a 273 that a 17" fan will still clear the radiator brace (OEM is 16"), an 18" fan is too close for my comfort unless the brace is cut out for clearance.
There is only about 3" of clearance from the fan bolts to the radiator so the bolts wont come all the way out. You have to loosen the alternator belts, loosen the bolts until they clear the threads, and then the fan and spacer will slide off sideways. You can then remove the bolts, put the new fan on the spacer, put the bolts in the holes, slide it back into place and tighten the bolts down. It's tight, but it can be done.
Here's the new fan:
Summit 17" Heavy Duty Six Bladed Fan
Part Number: SUM-G4920
Note the pitch:
Here's the old fan:
similar pitch but fewer blades and smaller diameter:
Here it is installed:
Here's some picts of the Hayden:
Note that the Hayden can be installed without removing the radiator if you have someone to help you. I put mine on an 18 fuse, fed directly off the battery and switched it through a 30 lighted switch on the dash (I use a piece of 1.75 angle iron to mount switches on and mount it under the dash.)
16" Hayden Automotive 3710 electric fan, "pusher" mounted on the front of the radiator.
from the top:
from the front (through the grill)
I wanted to replace the stock 16" 5 bladed mechanical fan on my 273 with something that would move more air. I priced NOS/Used 7 bladed fans for these engines and they were everywhere from $40 to $80 and more than I wanted to spend. I finally settled in on a Summit Racing 17" 6-bladed "heavy duty/high volume" universal fan for $27.
The blade pitch is steep so it moves a heap of air at idle and low speed when you really need it. I also have an electric fan installed and I'll include some details on that as well.
Note that in a 65" Dodge with a 273 that a 17" fan will still clear the radiator brace (OEM is 16"), an 18" fan is too close for my comfort unless the brace is cut out for clearance.
There is only about 3" of clearance from the fan bolts to the radiator so the bolts wont come all the way out. You have to loosen the alternator belts, loosen the bolts until they clear the threads, and then the fan and spacer will slide off sideways. You can then remove the bolts, put the new fan on the spacer, put the bolts in the holes, slide it back into place and tighten the bolts down. It's tight, but it can be done.
Here's the new fan:
Summit 17" Heavy Duty Six Bladed Fan
Part Number: SUM-G4920
Note the pitch:
Here's the old fan:
similar pitch but fewer blades and smaller diameter:
Here it is installed:
Here's some picts of the Hayden:
Note that the Hayden can be installed without removing the radiator if you have someone to help you. I put mine on an 18 fuse, fed directly off the battery and switched it through a 30 lighted switch on the dash (I use a piece of 1.75 angle iron to mount switches on and mount it under the dash.)
16" Hayden Automotive 3710 electric fan, "pusher" mounted on the front of the radiator.
from the top:
from the front (through the grill)
