help identify fan shroud. 1965?

[matte69]

This is a steel fan shroud that I have has for a long time and I don't know what it is for. I think it might be for a 65-66 Impala big block. The barrel is 4.5 inches wide.
The bolt holes are 12 1/8 center to center up and down, and 26 3/4 inches apart horizontally center to center.

http://www.flickr.com/photos/2816camaro/

Can anyone help identify this fan shroud?
Thanks for your help.

 

[quik9r]

To deep for BBC I would say small block, Attached is picture of my 65 factory big block wagon.

Kevin

 

[jester]

I do believe that for the 65 model year Chevy had a small, approx. 1" spacer that went between the radiator and the support on the big block , none A/C cars.
I'm older than dirt so I could be wrong

 

[matte69]

Thanks for your posts.

Kevin do you know anything about a spacer between the radiator and the support?

 

[SSpev]

That is the SBC fan shroud with heavy duty cooling. A 4 (maybe 3) core radiator also goes with it and a clutch fan. The setup would look like quik9ers wagon. It also has the spacer that jester refers to. I think the BBC had a solid mounted fan if it wasn't heavy duty cooling. I think the 409 had the same setup as the BBC. SBC standard cooling has a wide spacer, small radiator, a solid mounted fan and no shroud. The Chevelle also used a very similar shroud, but I don't remember what the difference is.

:

 

[matte69]

Great information. Thank you.

The heavy duty cooling, was that only available with air conditioning?

I believe the a/c cars had something different, but I do not understand the difference. I thought three shrouds were manufactured. A 6.5, 4.5, and 2.5 inch wide. I assumed the longest block would get the 2.5 shroud, and the shortest block the widest shroud. Knowing the longest block is a straight 6 and the shortest block is a sbc V8, I assumed the 4.5 would be for the BBC. So this is an education.

Anyway, can you tell me when the spacer was used and if a difference occurs when a car gets air conditioning?

Is the shroud on this car wrong?http://cgi.ebay.com/ebaymotors/Real...QQptZUS_Cars_Trucks?hash=item3caa575cd5#v4-31

Thanks.

 

[oldskydog]

Probably the best way to tell which fan shroud/fan configuration is correct is to look at a 65 AIM (Assembly Instruction Manual). It will show the applications for heavy duty cooling etc.
:

 

[SSpev]

I got one Cecil

upc 11-13 A8
L-6 std radiator #3002308 bolts to the support
v8 (sbc) std radiator #3002301 bolts spacer #3861763 that bolts to the support
No fan shrouds

upc L31 5 page 290
409 (both) shroud #3861760 radiator #302318 spacer #3861717

upc L35 4 page 302
radiator #30071111 bolts to spacer #3861717 that bolts to the support
no shroud

with Air
upc C60 B2 (with air) page 217
L-6 radiator #3002313 / #3002312 (M35) bolts to support with shroud #3861760

With Air
upc C60 B3 (with air) page 218
“283”, L30, L74 radiator #3002309 / 3002310 (M35) can't find the part number - 4 1/2" deep
L33 L35 (409 396) #3002319 / 3002315 (M35) shroud #3861760 - 2 1/2" deep
bolts to spacer #3861717 that bolts to the support

::

 

[SSpev]

Great information. Thank you.

The heavy duty cooling, was that only available with air conditioning?

I believe the a/c cars had something different, but I do not understand the difference. I thought three shrouds were manufactured. A 6.5, 4.5, and 2.5 inch wide. I assumed the longest block would get the 2.5 shroud, and the shortest block the widest shroud. Knowing the longest block is a straight 6 and the shortest block is a sbc V8, I assumed the 4.5 would be for the BBC. So this is an education.

Anyway, can you tell me when the spacer was used and if a difference occurs when a car gets air conditioning?

Is the shroud on this car wrong?http://cgi.ebay.com/ebaymotors/Real...QQptZUS_Cars_Trucks?hash=item3caa575cd5#v4-31

Thanks.

I don't have much info on a 66 Impala. If I remember right they had the same setup for a while. Then they went to a plastic shroud.

 

[matte69]

I got one Cecil

upc 11-13 A8
L-6 std radiator #3002308 bolts to the support
v8 (sbc) std radiator #3002301 bolts spacer #3861763 that bolts to the support
No fan shrouds

upc L31 5 page 290
409 (both) shroud #3861760 radiator #302318 spacer #3861717

upc L35 4 page 302
radiator #30071111 bolts to spacer #3861717 that bolts to the support
no shroud

with Air
upc C60 B2 (with air) page 217
L-6 radiator #3002313 / #3002312 (M35) bolts to support with shroud #3861760

With Air
upc C60 B3 (with air) page 218
“283”, L30, L74 radiator #3002309 / 3002310 (M35)
L33 L35 (409 396) #3002319 / 3002315 (M35)
bolts to spacer #3861717 that bolts to the support

::

This is great information. Thank you SSpev.

Ok anyone better than me at reading an assembly manual. It appears there was only one shroud, part number 3861760. It appears it was used on 409(L31) engines and straight 6 engines(L6) with a/c. Now I'm really confused.:?

Can anyone explain the assembly manual?

SSpey: Does the manual show a measurement for the shroud?

Thank you again for your help.

 

[SSpev]

Dang it I messed something up
I can see why you are confussed.
There are 2 Shrouds. "Ken" is wrong. What you have is a SBC part.
If you where to install YOURs on a BBC or a 409 the fan would sit to far in and not be as effective at cooling. The fan MUST have about 1/3 of the edge exposed. This allows the air to move off the tips of the fan.

I must of been drinking in-stead-of : :takethat
I have some pics/ scans/ measurements


This is you isn't it?
http://cgi.ebay.com/ebaymotors/65-6...r_Truck_Parts_Accessories?hash=item3caa3bf6a6

Ken is right about one thing. "Dont beleive everything someone tells you on this site. (Evil- bay)"

 

[matte69]

Yes, that is my auction.

Ken sold the same shroud approx. two weeks ago.

I agree that the fan blade trailing tips need to be exposed for this to work at its best. To narrow a shroud and the fan won't pull air through the radiator. To wide a shroud and at least some of the moving air could recirculate back throught the fan. The best situation is for the air to spin off the fan blade tip into the engine bay.

Since, the SBC had no shroud, I'm guessing this is for a sbc with heavy duty cooling. The a/c cars probably required heavy duty cooling which, might be this shroud and maybe a 3 or 4 core radiator. Just a theory.

What are your thoughts? Does the AIM support that theory?

SSpev, I thank you for your help. Your are really helping to clear-up some things. I was over on impalas.net last week and those guys, were helpful, but not nearly as knowledgable.

 

[SSpev]

Yes, that is my auction.

Since, the SBC had no shroud, I'm guessing this is for a sbc with heavy duty cooling. The a/c cars probably required heavy duty cooling which, might be this shroud and maybe a 3 or 4 core radiator. Just a theory.


What are your thoughts? Does the AIM support that theory?

SSpev, I thank you for your help. Your are really helping to clear-up some things. I was over on impalas.net last week and those guys, were helpful, but not nearly as knowledgable.

Base SBC had no shroud had a 5 inch spacer behind radiator. 4 blade solid fan
HD cooling had a shroud4 1/2 inch (yours) (which I can't find a part number to )and a 2 inch spacer. 5 blade with clutch

base BBC , no shroud with 2 inch space solid fan

L78, L31 L33, BBC HD cooling - best I can tell had 2 1/2 " shroud and 2" spacer and a clutch fan.

 

[matte69]

Awesome! Thanks a million.