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

My Boy's Toy · 06-21-2003, 04:36 PM

I'm Running a 275 Hp 327 ,4 core Rad. Should I run a fixed fan or a 20" with a fan clutch , & what Shroud will work with a 20" Fan on our trucks ?

**Stocker** · 06-21-2003, 04:43 PM

Can't advise on the shroud, but IMO use a clutch fan! A fixed fan will always be noisy and rob power. I once temporarily used a flex fan and it didn't cool well at all.

jef5150 · 06-21-2003, 05:20 PM

http://www.derale.com/main.shtml

Longhorn Man · 06-22-2003, 12:11 AM

Not to mentione the flax fans giving out and shooting a blade through the hood and any one's head that might be looking over the engine at that particular time.
While I have never heard of anyone being killed, and I admit it may well be an urban legond, I have seen first hand when the blades come free and cut right through the hood and brace. Not pretty. (even GM had a re-call on the stock flex fans)
A clutch with a fixed blade fan is the only way to go. Don't need to upgrade anything, just good condition stock items should cool your engine. I don't even have a Shroud on mine, and I have no problem cooling it.

**Yukon Jack** · 06-22-2003, 08:41 AM

Guy here in Wichita died about 2 years ago - confirmed on the news. Pretty scary, used to have one years ago. One of the vendors posted some info a while back on the different stock shrouds so hopefully they will see your post and get that info to you. I was kind of thinking about building one out of aluminum, could be a good option if done right.

slam33 · 06-22-2003, 11:25 AM

I'm runnig an alluminum flex fan with no problems but I'm looking at going stainless just to be safe. I got my shroud out of an 80's van and it bolted right in.

Longhorn Man · 06-22-2003, 11:37 AM

Hmmm, a van shroud, never thought of that. Your combo includes a small block with a short, or long pump?

**Canadian694x4** · 06-22-2003, 11:54 AM

Whats a flex fan look like cause my shroud definitely looks as tho a blade came flying off to bust the thing up...

**Stocker** · 06-22-2003, 01:46 PM

Quote:

Originally posted by Canadian694x4
Whats a flex fan look like

http://www.derale.com/hdflexfans.shtml

My Boy's Toy · 06-22-2003, 08:43 PM

Found a Shroud to work off of a 69 Gmc 305 , had to drill new holes 3/8" Higher , It fit & looks Great . Thanks for your input Paul

ZOOMY · 06-23-2003, 06:26 AM

i missed a shift once and a blade let go and went right thru the hood. The watewr pump then broke off and went thru the radiator. At least if there had been a shroud there, the hood would,ve been saved.........Zoomy

Longhorn Man · 06-23-2003, 05:55 PM

A flimsey little shroud isn't gonna save anything with a flex fan exploding at 6500 RPM...nothing but distance and time will stop it if it makes it through the hood and brace.

06-21-2003, 04:36 PM	#1
My Boy's Toy Registered User Join Date: Dec 2001 Location: West Unity, OH, USA Posts: 235	Fan Shroud ? I'm Running a 275 Hp 327 ,4 core Rad. Should I run a fixed fan or a 20" with a fan clutch , & what Shroud will work with a 20" Fan on our trucks ?

06-21-2003, 04:43 PM	#2
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Can't advise on the shroud, but IMO use a clutch fan! A fixed fan will always be noisy and rob power. I once temporarily used a flex fan and it didn't cool well at all. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

06-22-2003, 08:41 AM	#5
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Guy here in Wichita died about 2 years ago - confirmed on the news. Pretty scary, used to have one years ago. One of the vendors posted some info a while back on the different stock shrouds so hopefully they will see your post and get that info to you. I was kind of thinking about building one out of aluminum, could be a good option if done right. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

06-22-2003, 11:25 AM	#6
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	I'm runnig an alluminum flex fan with no problems but I'm looking at going stainless just to be safe. I got my shroud out of an 80's van and it bolted right in. __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

06-22-2003, 11:54 AM	#8
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,307	Whats a flex fan look like cause my shroud definitely looks as tho a blade came flying off to bust the thing up... __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 22 Yrs - 1 of 208 Built & Sold In Canada!- 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 3 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 17 Yrs- 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 15 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 8 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

06-21-2003, 05:20 PM	#3
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	http://www.derale.com/main.shtml

06-22-2003, 12:11 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Not to mentione the flax fans giving out and shooting a blade through the hood and any one's head that might be looking over the engine at that particular time. While I have never heard of anyone being killed, and I admit it may well be an urban legond, I have seen first hand when the blades come free and cut right through the hood and brace. Not pretty. (even GM had a re-call on the stock flex fans) A clutch with a fixed blade fan is the only way to go. Don't need to upgrade anything, just good condition stock items should cool your engine. I don't even have a Shroud on mine, and I have no problem cooling it.

06-22-2003, 11:37 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Hmmm, a van shroud, never thought of that. Your combo includes a small block with a short, or long pump?

06-22-2003, 08:43 PM	#10
My Boy's Toy Registered User Join Date: Dec 2001 Location: West Unity, OH, USA Posts: 235	Found a Shroud to work off of a 69 Gmc 305 , had to drill new holes 3/8" Higher , It fit & looks Great . Thanks for your input Paul

06-23-2003, 06:26 AM	#11
ZOOMY Senior Member Join Date: Feb 2003 Location: WIS Posts: 1,752	shroud i missed a shift once and a blade let go and went right thru the hood. The watewr pump then broke off and went thru the radiator. At least if there had been a shroud there, the hood would,ve been saved.........Zoomy

06-23-2003, 05:55 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	A flimsey little shroud isn't gonna save anything with a flex fan exploding at 6500 RPM...nothing but distance and time will stop it if it makes it through the hood and brace.



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