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06-29-2005, 02:04 PM
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#1 |
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Better late than never
 
Join Date: Dec 2001
Location: Columbus, IN
Posts: 324
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Fan/Shroud position
My fan currently sits totally within the throat of the shroud (the rear end of the blades are about 1" from the rear of the shroud). I am replacing a 3 core with a 4 core radiator and this will bring the fan further inside the shroud.
I read somewhere that the fan should have blades outside of the shroud about 1 inch for best performance. Is this true?
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1970 C/10 SWB Stepside |
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06-29-2005, 04:42 PM
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#2 |
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Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Yes.
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 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI |
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06-29-2005, 05:38 PM
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#3 |
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Senior Member
Join Date: Apr 2005
Location: metro Phoenix, AZ
Posts: 241
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Howdy:
talk to the fella at Manes Truck parts; the "heavy duty" fan shroud puts the fan blade further inside the shroud. hope this helps. cowboy |
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06-29-2005, 07:09 PM
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#4 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,692
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The 4-row radiator I put in my truck was externally the same size as the OEM 3-row; only the core is thicker, so the fit was the same.
That said, the fan sits half in and half out of the shroud. Never had an overheating problem, even in extreme conditions - even with the 3-row, and I've owned the truck for 28 years.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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06-29-2005, 07:30 PM
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#5 | |
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Registered User
Join Date: Jun 2005
Location: Sacramento CA
Posts: 1,255
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Quote:
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Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck. |
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06-29-2005, 10:16 PM
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#6 |
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Better late than never
Join Date: Dec 2001
Location: Columbus, IN
Posts: 324
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The 4 core I have is 3/4" wider than the 3 core at the top mounts. I need to find new mounts.
It has a long water pump. Here are some pics. I think maybe I should cut the adapter that sits between the fan and the pump shorter?
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1970 C/10 SWB Stepside |
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06-29-2005, 11:59 PM
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#7 |
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Senior Member
  
Join Date: Jan 2005
Location: CA
Posts: 5,773
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If you cut the adapter shorter, you had better have it done on a lathe. Otherwise your fan will not spin straight and will probably vibrate. I've seen adapters of various lengths for sale at auto parts stores.
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06-30-2005, 12:02 AM
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#8 |
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Better late than never
Join Date: Dec 2001
Location: Columbus, IN
Posts: 324
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Very good point PJ. I will look for a shorter adapter to buy.
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1970 C/10 SWB Stepside |
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06-30-2005, 12:46 AM
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#9 | |
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Registered User
Join Date: Jun 2005
Location: Sacramento CA
Posts: 1,255
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Quote:
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Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck. |
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