Identify Fan Shroud 64-65? - Impala Tech
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post #1 of 17 (permalink) Old 02-03-2010, 12:00 PM Thread Starter
 
 
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Question Identify Fan Shroud 64-65?

Hello. I am a Camaro guy, buy somehow over the years I acquired a fan shroud that I believe is for an early 60's Impala.

Can you help me identify it? Should it have a date code on it or any identifying marks. The only thing I can find is a "v" stamped into it. It is steel.

Relative to where the mounting brackets are and the placement of the engine within an Impala engine bay, I wonder if this is for a big block car.

Here is a link to some photos of the fan shroud.
http://www.flickr.com/photos/2816camaro/

If you need measurements just asks.
Thank you for your help.
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post #2 of 17 (permalink) Old 02-03-2010, 05:38 PM
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I don't think it's 65. Probably 64 and earlier.
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post #3 of 17 (permalink) Old 02-03-2010, 09:01 PM
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If it will fit a 61 283, I could use it, mine is MIA
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post #4 of 17 (permalink) Old 02-03-2010, 10:15 PM
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The Impala B-body puts the motor in the middle of the engine bay whether it is a BBC or a SBC, no off-set to worry about. Lots of room under the hood, and I usually order Chevelle headers in the size I want as they often do not list a good set of tubes for the Impala

Big Dave
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post #5 of 17 (permalink) Old 02-04-2010, 02:30 AM Thread Starter
 
 
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I think I've figured out the brackets or flanges. A factory A/C car has a radiator with double flanges. My shroud apparently mounts to the second set of flanges, not directly to the radiator core support. The first flanges on the radiator are used to bolt the radiator to the radiator core support.

Please correct me if I am wrong.

I appreciate your answers. My thought on the big block was in regard to the depth of the Impala engine bay and the fact that a big block is longer than a small block. Due to the extra size of a big block (at least on a Camaro) a shorter shroud had to be used. I would think an Impala would have a relatively longer shroud for a small block. The shroud must be deep enough to reach from the core support to the tip of the fan blade. With a small block, that's and extra few inches. (right or wrong, that was my reasoning)

Anyway, now I'm thinking this is for a factory A/C car. I still don't know the exact year.

Do 64 and earlier cars share a common fan shroud fit? (post#2)
Is your 61 a factory a/c car? (post #3)

Reading on this site under heating and cooling, I found a post that stated a 61 to 63 Impala radiator bolted to the core support with three bolts per side. A 64 used 6 bolts per side. My shroud has three bolts per side. Maybe this is a clue. Does anyone know the width of the mounting bolts holes on a 61-63? I'll measure my shroud and see if we have a match.

Any other comments are appreciated. Thanks for our help.

Last edited by ChrisM; 02-04-2010 at 03:46 AM. Reason: Edited to clarrify terms and add an aditional question.
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post #6 of 17 (permalink) Old 02-04-2010, 08:40 AM
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I am going to guess '65 small block. The design looks identical to my '65 396, but the shroud itself looks deeper (as per the shorter engine.) '66 went to plastic.
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post #7 of 17 (permalink) Old 02-04-2010, 09:42 AM
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It is not a 64
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post #8 of 17 (permalink) Old 02-04-2010, 01:38 PM Thread Starter
 
 
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Thank you Mike and Bob.
Ok, I'm still looking at the radiator as a clue to what this fits. Would it be possible for some members to post pics of their shrouds. Specifically I'd like to see a 63 & 65 small block. I'd also like to see a 65 big block.

The barrell portion of my shround measures 4 3/8 inches deep and 19 1/2 inches in diameter. The mouniting holes are roughly 26 3/4 apart (center to center) going across the shroud. The mounting holes are roughly 12 1/4 (center to center) going up and down. Can someone provide some measurements and list the year of the car being measured?

Again, thank you for your help.
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post #9 of 17 (permalink) Old 02-05-2010, 11:03 AM
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Chris,
It's definitely not '61-'64 Chevy. I've seen some that look like that on mid '60s Chevelles.

Verne
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post #10 of 17 (permalink) Old 02-05-2010, 12:58 PM
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This is what a 64 283 with AC shroud looks like.



This is what they sell for 56-63 Big Blocks
http://www.show-cars.com/cgi-bin/com...ction&key=7784



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post #11 of 17 (permalink) Old 02-06-2010, 10:53 AM Thread Starter
 
 
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Thank you David and Verne.

David I notice your shroud is wider and the brackets are different. It looks like your shroud bolts directly to the core support. Thanks for this information and the great pic.

I'm guessing this is either a 65 Impala or Chevelle. Still could be for a BBC. Anyone have a 65 BBC or SBC picture?
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post #12 of 17 (permalink) Old 02-06-2010, 11:44 AM
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That is the difference i was getting at, I think the small blocks have a 'deeper' shroud, while the big blocks were shallower.

The 64 shroud bolts on top of the radiator core support. The same bolts hold both in place. But they come apart from each other with the bolts removed, which can make for a bit of a juggling act when removing them



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post #13 of 17 (permalink) Old 02-06-2010, 12:13 PM
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Big Block is two inches longer than a Small Block so that would explain the difference.

Big Dave
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post #14 of 17 (permalink) Old 02-07-2010, 11:50 AM Thread Starter
 
 
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I'd like to thank everyone for their help.

I have this posted at Team Chevelle also.
I'm willing to call this a 65 (possible a 66) Impala 409-396 fan shroud.
If someone knows its not, please post a picture of what is. I have not ruled out 65 Chevelle, but I'm leaning toward the Impala.

At YearOne's part store website there is a difference between with a/c and heavy duty cooling and without. Does anyone know the difference?



Thank you for your help.

Last edited by ChrisM; 02-07-2010 at 12:00 PM. Reason: spelling
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post #15 of 17 (permalink) Old 02-07-2010, 05:30 PM
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The 409 was only available for the first five months of 1965 as the 396 was introduced to replace it in 1965. (all of the 1965 advertising showed pictures of the Mark IV but didn't mention the displacement as when the car was introduced Chevrolet had not yet finalized the displacement of the motor as of yet (they were debating releasing a big bore 409 with Mark IV porcupine heads just like the mystery motor that won the 1963 races; but at the last second decided on the small bore long stroke 396 as being more of a torque monster to move the heavier Impala and Caprice). Because of this the first 18 months of production 1965 396 blocks can be safely bored to 409 or 427 displacements as the cylinder walls were very thick. Late in the production year 1966 they finalized the design of the 396 with a thin wall casting that can not be overbored more than 0.060" safely, and changed the oiling at the same time (different rear cam bear).

Big Dave
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post #16 of 17 (permalink) Old 02-08-2010, 08:42 AM
 
 
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Dave, do you have the casting number of the 396 that can be bored to a 427? I knew there was a early block that could bore that far.
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post #17 of 17 (permalink) Old 02-22-2010, 06:43 PM Thread Starter
 
 
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I think this mystery is solved.

I have a thread going at 348-409.com. A member looked it up in a 1965 Factory Assembly Manual. It is for a SBC with heavy duty cooling. The L6 and SBC had no shroud unless heavy duty cooling or a/c. There is also a spacer invloved in applications without the heavy duty cooling or a/c.

To me it looks like GM used the spacer to move the radiator closer to the fan if the shroud was not used. Do your own research before you rely on me.

If you are interested here is a link.
http://www.348-409.com/forum/showthread.php?t=19378
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