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03-24-2021, 06:30 PM
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#1 |
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Registered User
Join Date: Aug 2014
Location: murfreesboro tn
Posts: 291
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72 c-20
Hey Guys Ive got a 72 C-20 stock 350 regular Exhaust no headers i bought a 3 row aluminum radiator last year i wasn't thinking clearly that day should have gotten a 4 row 180 thermostat its a daily Driver my temperature at times gets 190 ,195 in traffic regular engine fan how much coolness am i going to gain if i get a 4 row is it worth the money and time ?? Thanks Saddletramp
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03-24-2021, 06:33 PM
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#2 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,628
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Re: 72 c-20
That 3 row alum radiator should be plenty for a stock-ish 350. 190-195 is not hot. 220+ is hot
Get a clutch fan assembly if you are running just a flex solid fan Assuming you have a shroud |
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03-24-2021, 07:14 PM
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#3 |
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Registered User
 Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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Re: 72 c-20
You didn't say what deg thermostat you are running.
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03-24-2021, 07:15 PM
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#4 |
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Registered User
Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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Re: 72 c-20
My bad I missed it the first time.
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03-24-2021, 07:28 PM
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#5 |
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Registered User
Join Date: Aug 2014
Location: murfreesboro tn
Posts: 291
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Re: 72 c-20
Hi guys Thanks for the help whats a good brand clutch fan and where to get it ?? Thanks again Guys
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03-25-2021, 10:04 AM
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#6 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,771
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Re: 72 c-20
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I agree, there is nothing wrong with your temperatures. I don't start worrying until mine reaches 210º. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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03-25-2021, 11:16 AM
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#7 |
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Senior Member
 
Join Date: Jan 2005
Location: CA
Posts: 5,981
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Re: 72 c-20
Based on recommendations I found from searching the forum, I bought the following fan and clutch from Summit Racing.
DER-17118 https://www.summitracing.com/parts/DER-17118 HDA-2705 https://www.summitracing.com/parts/HDA-2705 I also bought a set of mounting studs from the Help! section at Napa. I think it was Dorman part number 23733. |
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03-25-2021, 01:41 PM
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#8 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,722
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Re: 72 c-20
Hayden #2747 (got mine at NAPA) is an excellent heavy-duty clutch. Pair that with a 7-blade (6 blade will work too) 18" diameter fan. And as noted, a fan shroud.
Hayden's site clearly explains the differences between Standard, Heavy-duty, and Severe-duty clutches. https://www.haydenauto.com/en/produc...-types/thermal
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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03-25-2021, 03:41 PM
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#9 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,722
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Re: 72 c-20
As noted above, 190-195 is not hot. That said, if you find yourself shopping for a new radiator, a heavy-duty 2-row aluminum is probably a better choice than a 4-row.
Check this thread http://67-72chevytrucks.com/vboard/s...d.php?t=817699
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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03-25-2021, 05:04 PM
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#10 |
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Registered User
Join Date: Aug 2014
Location: murfreesboro tn
Posts: 291
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Re: 72 c-20
Thank you always good information appreciate you Guys Great site
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03-26-2021, 12:09 PM
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#11 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: 72 c-20
My C-20 has a 3 row full aluminium tig welded radiator with normal 5 blade Chevy fan and shroud. Make sure the air is going through the radiator and not around it. Block off all area's of air going around the radiator and force it through the radiator. You can see the foam that I put around mine to seal it off.
My C-20 runs a 195* thermastat and it does good. If you don't have AC there is no need for a clutch fan. The motor fan should work just fine. Don't ever use a flex fan though. In fact mine runs a little cold in the winter time. 
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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03-26-2021, 07:39 PM
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#12 |
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Senior Member
Join Date: Apr 2013
Location: Northern ca. Wine country
Posts: 405
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Re: 72 c-20
Oh there is my 69 OLDS air cleaner.��
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03-26-2021, 08:57 PM
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#13 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,676
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Re: 72 c-20
A clutch fan will take less HP, and provides a racing edge. Not much, just a little. True, not really necessary without A/C. It's like using the 2-1/2" FI Corvette alternator pulley. The difference is most noticeable on small engines, but another trick to use when drag racing. A little here, a little there.
I was having a problem with my truck running hot, a problem that this truck has had the entire time that my PiL owned it. I'm talking 260º pulling hills, and idling. I put in a severe duty clutch, and that helped, but the high-flow thermostat got put in after noticing (when replacing the stock radiator) that there wasn't a whole lot of flow. New water pump previously, etc. This truck has run hot for so long that my wife didn't even know/remember that it had A/C, because it never got used, especially when towing the travel trailer, back when her father was still alive.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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