Fan shroud question! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Harpie · 10-16-2014, 07:20 PM

Ok I think I got this figured out but I know you guys can help me out. I swapped in a vortec 5.7 in my 71 and am getting everything ready to fire it for the first time in the truck. Dropped my radiator in (4row) and my small block factory fan shroud is not going to work. The fan is just a little big and I think if it had of fit will be past the fan. So if I'm reading everything correctly is the big block shroud thinner and possibly have a bigger opening for the fan? Hope that makes sense lol thanks for any advice in advance.

davepl · 10-16-2014, 07:22 PM

What's the size of the one you have?

Harpie · 10-16-2014, 07:27 PM

Fan looks to be 19in and that's right at the shroud opening size. Biggest issue is the thickness of the shroud.

Lee H · 10-16-2014, 07:44 PM

There's lots of fans available in the 16-18 inch range, check out Derale. The AC fan shroud is a little over 1 inch deeper than a non-AC shroud.

Undone · 10-16-2014, 07:56 PM

Quote:

Originally Posted by Lee H

There's lots of fans available in the 16-18 inch range, check out Derale. The AC fan shroud is a little over 1 inch deeper than a non-AC shroud.

Thought it was the other way around. Non AC deeper?

**FirstOwner69** · 10-16-2014, 08:31 PM

Quote:

Originally Posted by Undone

Thought it was the other way around. Non AC deeper?

I agree. Factory small block non-A/C shroud is 3/4" to 7/8" deeper than the A/C shroud. Here's a pic of them back to back. The A/C shroud is on the right.

Harpie · 10-16-2014, 07:49 PM

Ok thank you I'll see about changing the fan.

**FirstOwner69** · 10-16-2014, 08:54 PM

Quote:

Originally Posted by Harpie

Ok I think I got this figured out but I know you guys can help me out. I swapped in a vortec 5.7 in my 71 and am getting everything ready to fire it for the first time in the truck. Dropped my radiator in (4row) and my small block factory fan shroud is not going to work. The fan is just a little big and I think if it had of fit will be past the fan. So if I'm reading everything correctly is the big block shroud thinner and possibly have a bigger opening for the fan? Hope that makes sense lol thanks for any advice in advance.

What water pump are you running? Short, long or from the Vortec engine? Serpentine or V belts? Is the fan from the Vortec engine? If from the Vortec and serpentine, is the fan the right rotation?

Harpie · 10-16-2014, 08:58 PM

It's the complete power plant motor and trans from donor vehicle. It has the factory serp setup and fan and pump.

**FirstOwner69** · 10-16-2014, 10:18 PM

Quote:

Originally Posted by Harpie

It's the complete power plant motor and trans from donor vehicle. It has the factory serp setup and fan and pump.

I tried searching the forum for "serpentine fan shroud" and got some results that may help. Give it a try and see what you think. Just check to be sure the thread applies to 67-72 trucks.

Lee H · 10-16-2014, 09:43 PM

I stand corrected.

Harpie · 10-16-2014, 10:30 PM

Ill didn't try that wording thanks I'll do that now.

Harpie · 10-16-2014, 10:37 PM

Well that was what I needed looks like a BB shroud it is. Now to find a good deal on one. Thanks guys for the help!

10-16-2014, 07:20 PM	#1
Harpie Registered User Join Date: Jan 2012 Location: Durant OK Posts: 372	Fan shroud question! Ok I think I got this figured out but I know you guys can help me out. I swapped in a vortec 5.7 in my 71 and am getting everything ready to fire it for the first time in the truck. Dropped my radiator in (4row) and my small block factory fan shroud is not going to work. The fan is just a little big and I think if it had of fit will be past the fan. So if I'm reading everything correctly is the big block shroud thinner and possibly have a bigger opening for the fan? Hope that makes sense lol thanks for any advice in advance.

10-16-2014, 07:22 PM	#2
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Fan shroud question! What's the size of the one you have? __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

10-16-2014, 07:27 PM	#3
Harpie Registered User Join Date: Jan 2012 Location: Durant OK Posts: 372	Re: Fan shroud question! Fan looks to be 19in and that's right at the shroud opening size. Biggest issue is the thickness of the shroud.

10-16-2014, 07:44 PM	#4
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,141	Re: Fan shroud question! There's lots of fans available in the 16-18 inch range, check out Derale. The AC fan shroud is a little over 1 inch deeper than a non-AC shroud. __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

10-16-2014, 07:49 PM	#7
Harpie Registered User Join Date: Jan 2012 Location: Durant OK Posts: 372	Re: Fan shroud question! Ok thank you I'll see about changing the fan.

10-16-2014, 08:58 PM	#9
Harpie Registered User Join Date: Jan 2012 Location: Durant OK Posts: 372	Re: Fan shroud question! It's the complete power plant motor and trans from donor vehicle. It has the factory serp setup and fan and pump.

10-16-2014, 09:43 PM	#11
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,141	Re: Fan shroud question! I stand corrected. __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

10-16-2014, 10:30 PM	#12
Harpie Registered User Join Date: Jan 2012 Location: Durant OK Posts: 372	Re: Fan shroud question! Ill didn't try that wording thanks I'll do that now.

10-16-2014, 10:37 PM	#13
Harpie Registered User Join Date: Jan 2012 Location: Durant OK Posts: 372	Re: Fan shroud question! Well that was what I needed looks like a BB shroud it is. Now to find a good deal on one. Thanks guys for the help!



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