BBC fan shroud - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big70 · 02-04-2019, 01:55 PM

So in my 70 lwb I went from a sbc to a bbc and the fan shroud is way smaller. Does any one know where I can get a fan shroud for cheap? Lmc wants 160$ for the one for the 402. I jacked mine up by cutting it.

**Jcfcamaro** · 02-04-2019, 04:48 PM

Pretty sure the Sb shroud is bigger then the big block. Normally you slide the engine crossmember up to the front 6 cylinder holes for a Big block.

**zicc1835** · 02-04-2019, 09:49 PM

Quote:

Originally Posted by Jcfcamaro

Pretty sure the Sb shroud is bigger then the big block. Normally you slide the engine crossmember up to the front 6 cylinder holes for a Big block.

I have both shrouds neither are for sale i will take some measurments and pics tomorrow if you like ....but i should say its the other way around i think th SBC shroud is smaller and you move the engine stands ( not the crossmember)to the forward holes in the frame on a IN6 to a SB not sure of the position on the BB got one of those also ill check that tomorrow hope Im correct on all this if Im wrong Im sure there are others with more knowledge than I

Mike C · 02-04-2019, 09:58 PM

The big block shroud has an opening that goes up higher than the SB shroud. The big block water pump is much higher in the chassis than the small block setup.

You might be able to cobble together something, but in the end I think you will wind up buying a big block shroud. You might get lucky and find a used one where somebody is parting out a truck or LS swapping.

**71CHEVYSHORTBED402** · 02-05-2019, 01:09 PM

They come up on the parts board every so often. The part # is 3924932, you might check Ebay

**Jcfcamaro** · 02-05-2019, 01:15 PM

Here are some pictures. 69 396 and a 72 350.

**kwmech** · 02-05-2019, 02:56 PM

Both the small block and big block use the same frame holes. The big block stands are bent back 1.25 or 1.5'' more than the small block.

02-04-2019, 01:55 PM	#1
Big70 Registered User Join Date: Sep 2018 Location: Sacramento,CA Posts: 85	BBC fan shroud So in my 70 lwb I went from a sbc to a bbc and the fan shroud is way smaller. Does any one know where I can get a fan shroud for cheap? Lmc wants 160$ for the one for the 402. I jacked mine up by cutting it. __________________ 70 custom10 swb fleet side 454 th400

02-04-2019, 04:48 PM	#2
Jcfcamaro Senior Member Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,051	Re: BBC fan shroud Pretty sure the Sb shroud is bigger then the big block. Normally you slide the engine crossmember up to the front 6 cylinder holes for a Big block.

02-04-2019, 09:58 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,714	Re: BBC fan shroud The big block shroud has an opening that goes up higher than the SB shroud. The big block water pump is much higher in the chassis than the small block setup. You might be able to cobble together something, but in the end I think you will wind up buying a big block shroud. You might get lucky and find a used one where somebody is parting out a truck or LS swapping. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

02-05-2019, 01:09 PM	#5
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,137	Re: BBC fan shroud They come up on the parts board every so often. The part # is 3924932, you might check Ebay __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring the truck from ground up. With assys, the guide accts for 1000s details, OEM identifications & part numbers, written in short order. 700+ images of assm., illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025

02-05-2019, 01:15 PM	#6
Jcfcamaro Senior Member Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,051	Re: BBC fan shroud Here are some pictures. 69 396 and a 72 350. Attached Images

02-05-2019, 02:56 PM	#7
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,403	Re: BBC fan shroud Both the small block and big block use the same frame holes. The big block stands are bent back 1.25 or 1.5'' more than the small block.



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