Fan

BobCit

BobCit

Apprentice
Sep 30, 2007
75
1
8
North Jersey
#1
Would any one know what diameter the stock radiator fan is on the 79 Grand Prix with a V-8
 
79 GP 4 speed

79 GP 4 speed

Greasemonkey
Nov 12, 2017
158
63
28
#2
The fan shroud is about 20 1/2 inches, about 3/4 inch clearance, which would make the fan about 19 inches. That was the best I could get with it in the car yet.
 
BobCit

BobCit

Apprentice
Sep 30, 2007
75
1
8
North Jersey
#3
The fan shroud is about 20 1/2 inches, about 3/4 inch clearance, which would make the fan about 19 inches. That was the best I could get with it in the car yet.
The fan shroud is about 20 1/2 inches, about 3/4 inch clearance, which would make the fan about 19 inches. That was the best I could get with it in the car yet.
Are you running a flex Fan Or the stock fan in your GP
 
79 GP 4 speed

79 GP 4 speed

Greasemonkey
Nov 12, 2017
158
63
28
#4
I am running the stock fan. If you would like I could take pictures of it later today
 
BobCit

BobCit

Apprentice
Sep 30, 2007
75
1
8
North Jersey
#5
I am running the stock fan. If you would like I could take pictures of it later today
My GP has a flex fan right now. I thought it would be a simple matter to change it back to a fan clutch and fan blade.
Purchasing the fan clutch is the easy part every auto parts store has them. The fan blade turned out to be a different matter. Only two companies I saw Hayden and Derale had fan blades available for the GP.
The Derale 19” fan blade actually 19.5”. I think that could be a problem. Still working on getting the specs for the Hayden fan blade. I may have to go with the 18” fan blade
 
79 GP 4 speed

79 GP 4 speed

Greasemonkey
Nov 12, 2017
158
63
28
#6
Have you checked with any pick n pulls to see if they have any. I would think a fan out of just about any gbody would work.
 
BobCit

BobCit

Apprentice
Sep 30, 2007
75
1
8
North Jersey
#7
Have you checked with any pick n pulls to see if they have any. I would think a fan out of just about any gbody would work.
Pick n pulls are far and few between in northern NJ. Especially for older vehicles. I installed an 18” fan and a standard duty fan clutch yesterday.
So far every thing is good. Not running hot or over heating. It’s amazing how much quieter the engine is with out the flex fan.
 
79 GP 4 speed

79 GP 4 speed

Greasemonkey
Nov 12, 2017
158
63
28
#8
Glad everything is working out. Guess I need to start getting more gbody parts from the pick n pulls around here including fans
 

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