Radiator Shroud - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**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.

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** · 12-09-2009, 09:33 PM

Quote:

Originally Posted by dazza

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.

Had no reason to mount it where I did, but I have noticed a small amount of cavitation. Plan to mount a speed controller to see if that helps

Quote:

Originally Posted by 425HP409

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

You seem to have some knowledge on the subject, why do you state moving the fan out will work

Quote:

Originally Posted by Gene

What about HEI? Will it still fit?

Tight, but it will fit, but my dizzy has the coil in the cap

dazza · 12-10-2009, 01:25 AM

ok, I used shorted brackets which brought it back a bit. The brackets hold it very securely, however when I put 3/8" of sponge-rubber weatherstrip around the outside edge, I thought I was going to need a huge press to get it in! Finally with a bit of clamping I got it to set perfectly. It would be a struggle to get it out... so hopefully this will keep temps correct. Shouldn't be to bad if I need to go back to the original, best of all - NO HOLES IN MY SHROUD!!
I fired it up she's definitely a sucker! Hard to tell how loud it will be in the truck, a little loud now but it's very quiet around here.

Any idea what the cfm rating on this fan is?

**jaros44sr** · 12-10-2009, 01:48 AM

Quote:

Originally Posted by dazza

ok, I used shorted brackets which brought it back a bit. The brackets hold it very securely, however when I put 3/8" of sponge-rubber weatherstrip around the outside edge, I thought I was going to need a huge press to get it in! Finally with a bit of clamping I got it to set perfectly. It would be a struggle to get it out... so hopefully this will keep temps correct. Shouldn't be to bad if I need to go back to the original, best of all - NO HOLES IN MY SHROUD!!
I fired it up she's definitely a sucker! Hard to tell how loud it will be in the truck, a little loud now but it's very quiet around here.

Any idea what the cfm rating on this fan is?

Nice work! Don't know the CFM, but I do know mine really SUCKS

Are you going to install a relay? Supposedily, these can pull 80 amps at start up

dazza · 12-10-2009, 02:11 AM

80 amps!? I've heard 30 and 20 but 80 seems a bit much. I've only researched the relays briefly, but will be getting something. I need to look into hooking it up to my trinary switch as well.
what's the rating on your relay?

**jaros44sr** · 12-10-2009, 01:20 PM

You may be right, just thought I read that somewhere. Anyway, I searched Tyco site for part number-VF4-1511-Z01 but couldn't find an exact match. This is the relay M&H supplied with my harness for the electric fan application

dazza · 12-10-2009, 02:21 PM

are you using a radiator probe or a sensor in your head?

**jaros44sr** · 12-10-2009, 03:28 PM

Quote:

Originally Posted by dazza

are you using a radiator probe or a sensor in your head?

I have the factory senser in the intake manifold, but you could weld in a 1/2" NPT bong in the radiator. Didn't like shoving the probe into the fins of the rad

stevewhitmore · 12-10-2009, 05:13 PM

Mine was a stock fan set up, sorry but can't help you with the electric fan set up, but looking at it, I think they put them in a bit because that is the stronger part of the shroud

TDs6t9 · 12-10-2009, 05:49 PM

Sorry, been off the site for a few days. I have a stock fan, no clutch on my setup as asked previously. I have not gone the electric fan route. I know more folks than not use them but just my preference. The stands I used, all I did was take them off the 6 cyl. and put them on the 8. They bolted right up to the motor. Im running the old points style distributor and yes it is tight but manageable. Hope this answers any questions about my setup..

dazza · 12-10-2009, 06:31 PM

Sorry Steve,
Didn't mean to attempt a hostile take-over of the thread!

lt704 · 12-10-2009, 09:22 PM

Hi tony thanks for the update. I may go back to the clutch fan now that I learned from the guys on this site on how the fan is supose to fit and what kind of shroud to use. thank you.

12-09-2009, 07:22 PM	#26
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

12-09-2009, 08:10 PM	#28
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 ?

12-10-2009, 01:25 AM	#31
dazza Registered User Join Date: Aug 2002 Location: California Posts: 971	Re: Radiator Shroud ok, I used shorted brackets which brought it back a bit. The brackets hold it very securely, however when I put 3/8" of sponge-rubber weatherstrip around the outside edge, I thought I was going to need a huge press to get it in! Finally with a bit of clamping I got it to set perfectly. It would be a struggle to get it out... so hopefully this will keep temps correct. Shouldn't be to bad if I need to go back to the original, best of all - NO HOLES IN MY SHROUD!! I fired it up she's definitely a sucker! Hard to tell how loud it will be in the truck, a little loud now but it's very quiet around here. Any idea what the cfm rating on this fan is? Attached Images __________________ --------------------------------------------------------- I'm not crazy, I'm chosen, there's a difference. ---------------------------- '72 K10 SWB, 350, sm465/np205 ---- ----

12-10-2009, 02:11 AM	#33
dazza Registered User Join Date: Aug 2002 Location: California Posts: 971	Re: Radiator Shroud 80 amps!? I've heard 30 and 20 but 80 seems a bit much. I've only researched the relays briefly, but will be getting something. I need to look into hooking it up to my trinary switch as well. what's the rating on your relay? __________________ --------------------------------------------------------- I'm not crazy, I'm chosen, there's a difference. ---------------------------- '72 K10 SWB, 350, sm465/np205 ---- ----

12-10-2009, 01:20 PM	#34
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,766	Re: Radiator Shroud You may be right, just thought I read that somewhere. Anyway, I searched Tyco site for part number-VF4-1511-Z01 but couldn't find an exact match. This is the relay M&H supplied with my harness for the electric fan application __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

12-10-2009, 02:21 PM	#35
dazza Registered User Join Date: Aug 2002 Location: California Posts: 971	Re: Radiator Shroud are you using a radiator probe or a sensor in your head? __________________ --------------------------------------------------------- I'm not crazy, I'm chosen, there's a difference. ---------------------------- '72 K10 SWB, 350, sm465/np205 ---- ----

12-10-2009, 05:13 PM	#37
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Radiator Shroud Mine was a stock fan set up, sorry but can't help you with the electric fan set up, but looking at it, I think they put them in a bit because that is the stronger part of the shroud

12-10-2009, 05:49 PM	#38
TDs6t9 Registered User Join Date: Apr 2005 Location: Portsmouth, VA Posts: 59	Re: Radiator Shroud Sorry, been off the site for a few days. I have a stock fan, no clutch on my setup as asked previously. I have not gone the electric fan route. I know more folks than not use them but just my preference. The stands I used, all I did was take them off the 6 cyl. and put them on the 8. They bolted right up to the motor. Im running the old points style distributor and yes it is tight but manageable. Hope this answers any questions about my setup..

12-10-2009, 06:31 PM	#39
dazza Registered User Join Date: Aug 2002 Location: California Posts: 971	Re: Radiator Shroud Sorry Steve, Didn't mean to attempt a hostile take-over of the thread! __________________ --------------------------------------------------------- I'm not crazy, I'm chosen, there's a difference. ---------------------------- '72 K10 SWB, 350, sm465/np205 ---- ----

12-10-2009, 09:22 PM	#40
lt704 Registered User Join Date: Jun 2009 Location: Berkley, Massachusetts Posts: 235	Re: Radiator Shroud Hi tony thanks for the update. I may go back to the clutch fan now that I learned from the guys on this site on how the fan is supose to fit and what kind of shroud to use. thank you.



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