Radiator Shroud - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stevewhitmore · 11-23-2009, 10:51 AM

Will a shroud for a 4x4 bolt up to a non 4x4 radiator?
My 350 engine is set back in the 6 cyl location and I am trying to get the shroud closer to the fan.
I hear that in a 4x4 the engine was set back in the 6 cyl location so I need a 4x4 shroud?
or can you buy spacers for the fan?
Thanks

Sinister · 11-23-2009, 11:02 AM

Don't know about the shroud, but you can get fan spacers. Try Summit.

67chevemall · 11-23-2009, 11:33 AM

Sounds like you need to fab something up.
If you get two shrouds you could mate the two for double the lenght

paintpyro · 11-23-2009, 12:26 PM

From what Ive heard, the 4x4 shroud is exactly what you need. I just havent dropped the money to do it myself yet.

**425HP409** · 11-23-2009, 02:57 PM

I am going to have a 72 4x4 Jimmy in my shop tomorrow and I will report back to you about the shroud. The thing to remember about fan shrouds is that the fan must be positioned about halfway in the shroud and halfway out of the shroud. This allows the fan to pull the maximum amount of air through the shroud. If the fan is too deep in the shroud it cavitates the air in the shroud. If it is too far out of the shroud, it will pull some air around the shroud, and not through it. I have repaired many overheating problems, especially with big blocks, by positioning the fan correctly in the shroud.

stevewhitmore · 11-23-2009, 03:23 PM

So the fan pulls the air in and does not push it out the front, I guess that makes sense,but news to me!

TDs6t9 · 11-23-2009, 05:37 PM

I put a 350 in my '69 in the six cylinder location. I ordered a fan shroud part number 32-2820 from LMC for about $70. My fan sits about half in and half out of the shroud. I had to trim about 3" off the top because the blades were real close at that point. It was a straight bolt in and does what it is suppose to do. Hope this helps..

stevewhitmore · 11-23-2009, 07:41 PM

Thanks, that is the part number I just ordered, how did you trim the top?

stevewhitmore · 12-01-2009, 09:06 PM

Tony D
Thanks for the advice. I just installed the shroud you suggested and it fits perfect and the fan is half in and half out as it should be

stevewhitmore · 11-23-2009, 03:20 PM

From pictures that I have seen in parts catalogues, the 4x4 shroud is very different than the standard shroud and will not work unfortunately

Gene · 11-23-2009, 07:00 PM

So 4x4 smallblock sits in a different position than a 2wd truck? I was hoping to be able to use my 2wd shroud on my 4wd conversion. I hate to buy a new shroud, mine is still pretty new

Rack Man · 11-25-2009, 01:32 PM

Quote:

Originally Posted by Gene

So 4x4 smallblock sits in a different position than a 2wd truck? I was hoping to be able to use my 2wd shroud on my 4wd conversion. I hate to buy a new shroud, mine is still pretty new

Yea, the engine sits back approx. 3" closer to the firewall on the 4x4 trucks....So you're gonna need a new shroud !

RM

Gene · 12-09-2009, 07:59 PM

Quote:

Originally Posted by Rack Man

Yea, the engine sits back approx. 3" closer to the firewall on the 4x4 trucks....So you're gonna need a new shroud !

RM

What about HEI? Will it still fit?

57larry · 12-09-2009, 08:10 PM

I"m confused-------why do you put a V8 in the 6 cyl mountholes? are 6 cyl and V8 mounts different sizes ?

Jacfourteen · 12-09-2009, 08:42 PM

Quote:

Originally Posted by 57larry

I"m confused-------why do you put a V8 in the 6 cyl mountholes? are 6 cyl and V8 mounts different sizes ?

The v6 and I6 motor stands sit in the rear mount holes, while the v8 stands sit in the front set of holes. My small block is in the 6 cyl mount location. This is because when I swapped out the 351 V6 I didn't want to move the transmission, lengthen the driveshaft, etc. I suspect that the others prob swapped out I6's since they are more common. To solve my fan distance issue I am in the process of mounting up a 16" e fan/shroud combo out of summit with a thermostat.

**jaros44sr** · 11-25-2009, 03:11 PM

Quote:

Originally Posted by Gene

So 4x4 smallblock sits in a different position than a 2wd truck? I was hoping to be able to use my 2wd shroud on my 4wd conversion. I hate to buy a new shroud, mine is still pretty new

You can use a 2WD shroud in a 4X4, especially if you use the electric fan outta the Chrysler/Jeep

Not to disagree with Rack man, because he is correct

**jaros44sr** · 11-23-2009, 07:31 PM

Quote:

Originally Posted by stevewhitmore

Will a shroud for a 4x4 bolt up to a non 4x4 radiator?
My 350 engine is set back in the 6 cyl location and I am trying to get the shroud closer to the fan.
I hear that in a 4x4 the engine was set back in the 6 cyl location so I need a 4x4 shroud?
or can you buy spacers for the fan?
Thanks

Yes, the shrouds are bolted up the same on the rad. mounts and core support. I just changed out my 4x4 shroud for a 2WD shroud, so I can mount up a chrysler/jeep electric fan, fits exactly in the hole

dazza · 12-08-2009, 08:18 PM

Quote:

Originally Posted by jaros44sr

Yes, the shrouds are bolted up the same on the rad. mounts and core support. I just changed out my 4x4 shroud for a 2WD shroud, so I can mount up a chrysler/jeep electric fan, fits exactly in the hole

jaro44sr - I'm going to be doing the chrysler/jeeep e-fan install as well, will it work with the 4x4 shroud? I didn't see any reference to that in 71Rat's FAQ page.

**jaros44sr** · 12-08-2009, 09:33 PM

Quote:

Originally Posted by dazza

jaro44sr - I'm going to be doing the chrysler/jeeep e-fan install as well, will it work with the 4x4 shroud? I didn't see any reference to that in 71Rat's FAQ page.

Yes, I've installed the fan in both shrouds with equally good results. I ran a 1/4" strip of insulation before installing the fan

lt704 · 12-08-2009, 09:20 PM

Hi Tony, I have a 1968 c-10. My 350 engine also sits were the six cy. sits. I was having an over heating problem..I had a aftermarket electric fan as well as a clutch type fan. The fan was too fsr back from the radiator. I took out the clutch fan and now run the two fan aftermarket assembly. was this the right thing to do ?. I do not have a shroud on my radiator. my electric fan is on a on/off switch, not a thermostat switch. I f iforget to turn on the electric heat my truck can overheat at idle, also after i shut down my truck i sometimes have to leave the electric fan on for up to 20 minutes to bring down the engine temp. Anyone have any suggestions ? Was this method the best choice for my truck ?. thank you

dazza · 12-09-2009, 12:33 AM

Good idea on the insulation. I'm actually attempting to mount the fan without drilling or cutting my shroud. We'll see how it goes...

**jaros44sr** · 12-09-2009, 02:06 AM

Quote:

Originally Posted by dazza

Good idea on the insulation. I'm actually attempting to mount the fan without drilling or cutting my shroud. We'll see how it goes...

post up some pics when you can, I'm curious to see other ways

dazza · 12-09-2009, 02:58 AM

Quote:

Originally Posted by jaros44sr

post up some pics when you can, I'm curious to see other ways

More to do tomorrow, but just putting the fan in the shroud without bolting it in seems very secure. When I cut the tabs I left a bit to make it snug and tight. I may use different brackets in place of the silver ones, maybe one that will hook over the edge of the fan for extra protection.

dazza · 12-09-2009, 05:44 PM

I was just scanning some other posts and found some saying the fan blades need to be half-in, half-out of the shroud. Is that for the stock fan? Should this be mounted at the back edge of the shroud?
Looks as if everybody that posted pics of their mopar e-fans has them dropped in a few inches.

**425HP409** · 12-09-2009, 07:22 PM

If I was putting an electric fan in the shroud, I would put it at the rear edge fo the shroud for optimum performance.

11-23-2009, 10:51 AM	#1
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Radiator Shroud Will a shroud for a 4x4 bolt up to a non 4x4 radiator? My 350 engine is set back in the 6 cyl location and I am trying to get the shroud closer to the fan. I hear that in a 4x4 the engine was set back in the 6 cyl location so I need a 4x4 shroud? or can you buy spacers for the fan? Thanks

11-23-2009, 11:02 AM	#2
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: Radiator Shroud Don't know about the shroud, but you can get fan spacers. Try Summit. __________________ Beat it to fit, Paint it to match...

11-23-2009, 11:33 AM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: Radiator Shroud Sounds like you need to fab something up. If you get two shrouds you could mate the two for double the lenght __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

11-23-2009, 12:26 PM	#4
paintpyro Registered User Join Date: Aug 2001 Location: Santa Fe Springs, CA,USA Posts: 1,579	Re: Radiator Shroud From what Ive heard, the 4x4 shroud is exactly what you need. I just havent dropped the money to do it myself yet. __________________ 70 shortbed stepside "Schleprock" 350 w/TH400 rallys and BFGs -We can rebuild it, we have the technology-lower,shinier,faster

11-23-2009, 02:57 PM	#5
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Re: Radiator Shroud I am going to have a 72 4x4 Jimmy in my shop tomorrow and I will report back to you about the shroud. The thing to remember about fan shrouds is that the fan must be positioned about halfway in the shroud and halfway out of the shroud. This allows the fan to pull the maximum amount of air through the shroud. If the fan is too deep in the shroud it cavitates the air in the shroud. If it is too far out of the shroud, it will pull some air around the shroud, and not through it. I have repaired many overheating problems, especially with big blocks, by positioning the fan correctly in the shroud. __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

11-23-2009, 03:23 PM	#6
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Radiator Shroud So the fan pulls the air in and does not push it out the front, I guess that makes sense,but news to me!

11-23-2009, 05:37 PM	#7
TDs6t9 Registered User Join Date: Apr 2005 Location: Portsmouth, VA Posts: 59	Re: Radiator Shroud I put a 350 in my '69 in the six cylinder location. I ordered a fan shroud part number 32-2820 from LMC for about $70. My fan sits about half in and half out of the shroud. I had to trim about 3" off the top because the blades were real close at that point. It was a straight bolt in and does what it is suppose to do. Hope this helps..

11-23-2009, 07:41 PM	#8
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Radiator Shroud Thanks, that is the part number I just ordered, how did you trim the top?

12-01-2009, 09:06 PM	#9
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Radiator Shroud Tony D Thanks for the advice. I just installed the shroud you suggested and it fits perfect and the fan is half in and half out as it should be

11-23-2009, 03:20 PM	#10
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Radiator Shroud From pictures that I have seen in parts catalogues, the 4x4 shroud is very different than the standard shroud and will not work unfortunately

11-23-2009, 07:00 PM	#11
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Re: Radiator Shroud So 4x4 smallblock sits in a different position than a 2wd truck? I was hoping to be able to use my 2wd shroud on my 4wd conversion. I hate to buy a new shroud, mine is still pretty new

12-09-2009, 08:10 PM	#14
57larry Registered User Join Date: Nov 2007 Location: Indianapolis Posts: 1,161	Re: Radiator Shroud I"m confused-------why do you put a V8 in the 6 cyl mountholes? are 6 cyl and V8 mounts different sizes ?

12-08-2009, 09:20 PM	#20
lt704 Registered User Join Date: Jun 2009 Location: Berkley, Massachusetts Posts: 235	Re: Radiator Shroud Hi Tony, I have a 1968 c-10. My 350 engine also sits were the six cy. sits. I was having an over heating problem..I had a aftermarket electric fan as well as a clutch type fan. The fan was too fsr back from the radiator. I took out the clutch fan and now run the two fan aftermarket assembly. was this the right thing to do ?. I do not have a shroud on my radiator. my electric fan is on a on/off switch, not a thermostat switch. I f iforget to turn on the electric heat my truck can overheat at idle, also after i shut down my truck i sometimes have to leave the electric fan on for up to 20 minutes to bring down the engine temp. Anyone have any suggestions ? Was this method the best choice for my truck ?. thank you

12-09-2009, 12:33 AM	#21
dazza Registered User Join Date: Aug 2002 Location: California Posts: 971	Re: Radiator Shroud Good idea on the insulation. I'm actually attempting to mount the fan without drilling or cutting my shroud. We'll see how it goes... __________________ --------------------------------------------------------- I'm not crazy, I'm chosen, there's a difference. ---------------------------- '72 K10 SWB, 350, sm465/np205 ---- ----

12-09-2009, 05:44 PM	#24
dazza Registered User Join Date: Aug 2002 Location: California Posts: 971	Re: Radiator Shroud I was just scanning some other posts and found some saying the fan blades need to be half-in, half-out of the shroud. Is that for the stock fan? Should this be mounted at the back edge of the shroud? Looks as if everybody that posted pics of their mopar e-fans has them dropped in a few inches. __________________ --------------------------------------------------------- I'm not crazy, I'm chosen, there's a difference. ---------------------------- '72 K10 SWB, 350, sm465/np205 ---- ----



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12-09-2009, 07:22 PM	#25
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Re: Radiator Shroud If I was putting an electric fan in the shroud, I would put it at the rear edge fo the shroud for optimum performance. __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

Register or Log In To remove these advertisements.