On my car, there are 5 blades on the fan. While looking on an AC Delco parts supplier web site, they listed an OEM fan with 6 blades. How many of you have the 5 blade and how many the 6?

Also, I am guessing the 6 blade would be a good upgrade over the 5. I was going to go with the dual fan set up, but since I installed the Hypertech fan switch on at 200 off at 180, with a 180 degree thermostat, i don't see the need for dual fans especially with under 220 HP. What do you think?

 

An extra fan blade isn't really going to make any difference in cooling. Granted, the blade is designed similar.
If the 5 blade fan has slightly more pitch than the 6 blade fan, they will probably move the same amount of air.
A 6 bladed fan is easier to balance though, and make take slightly less amperage to draw the same cfm as a 5 blade fan

 

Cool on the balance and the amps. I may just go ahead and buy the 6 blade fan and check out the difference. No harm in having and extra fan on hand.

 

The 6 blade fan is probably for the dual fan setup as
those fans are 6blade. I have noticed two styles of
blades for the single fans:'83-mid'85 has 5 curved,
swept-back blades,late '85-92(and into 4th gen)
has straight,paddle like blades.Both types are often
out of balance and vibrate when running,i have
balanced a few using lead tape or screws on the
outer ring.