Upgrade: Installing the longer 2WD 3/4 ton 454 radiator

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Bextreme04

Full Access Member
Joined
May 13, 2019
Posts
4,436
Reaction score
5,564
Location
Oregon
First Name
Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
So is that fan a reverse rotation fan? I’d love to upgrade to that fan for my suburban with a 6.2 in it. I don’t have heat issues but it would be good for the a/c in the summertime.

Yes, it was the stock fan/clutch from my donor 1997 K2500 suburban with the L29 Gen VI 454. Reverse rotation 9 bladed metal fan. I went wit ha dual electric setup because I don't like the heavy fan noise all the time and I like the versatility of the electric setup.
 

Itali83

Full Access Member
Joined
Feb 7, 2015
Posts
575
Reaction score
1,078
Location
Maine
First Name
Ben
Truck Year
1982, 1987, 1987
Truck Model
K10, 'burban C10, Jimmy
Engine Size
350, 6.2, 350
Yes, it was the stock fan/clutch from my donor 1997 K2500 suburban with the L29 Gen VI 454. Reverse rotation 9 bladed metal fan. I went wit ha dual electric setup because I don't like the heavy fan noise all the time and I like the versatility of the electric setup.
Ok thanks, so that won’t work for my 6.2. Any idea if there is a normal rotation fan like that?
 

austinado16

Full Access Member
Joined
May 25, 2012
Posts
611
Reaction score
222
Location
Central Coast, CA
First Name
Todd
Truck Year
1990 w/307k miles on the clock
Truck Model
GMC V1500 Suburban SLE
Engine Size
5.7L TBI/4L60/3.42's
Eric, can you post photos of your electric fan set up and talk more about it?
 

austinado16

Full Access Member
Joined
May 25, 2012
Posts
611
Reaction score
222
Location
Central Coast, CA
First Name
Todd
Truck Year
1990 w/307k miles on the clock
Truck Model
GMC V1500 Suburban SLE
Engine Size
5.7L TBI/4L60/3.42's
Today I measured my big 7 blade 454 (reverse rotation) fan, and the 9 blade fan from Eric.

7 blade fan
Overall diameter: 19.5"

Individual blade area: 30.375 sq/in

Total blade area: 212.625 sq/in







9 blade fan

Overall diameter: 20.0"

Individual blade area: 20.625 sq/in

Total blade area: 185.625 sq/in



I was hoping to find some kind of a fan CFM calculator online, but couldn't. Maybe it's a mute point though, because the 7 blade fan has a larger surface area, and it's got a much more aggressive pitch. It probably moves quite a bit more air, but at the expense of noise, and probably 1-2mpg. I need CFM for the heat I tow in, at low speeds, so I'll stick with my existing 7 blade.
 

Forum statistics

Threads
44,057
Posts
948,514
Members
36,124
Latest member
dabsRus420
Top