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#1 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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radiator size differences
What are the differences between the 2, 3 and 4 core rads? I'm having a little overheating prob (not bad) but think I may have a 2 core rad since the engine was originally a six cyl. Would it be better to buy a new 4 core or go w/ used and have it cleaned? Thanks, sb
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#2 | |
Damn Yankee
Join Date: Feb 2007
Location: Lynchburg, VA
Posts: 2,261
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Re: radiator size differences
Quote:
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#3 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
Thanks. The odd thing is that it gets hottest on the highway. Would that be air or coolant flow prob??
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#4 |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: radiator size differences
Take off the radiator cap and look inside. From front to back you can count the number of rows. I you do not have shroud (most Six’s did not have a full shroud) you can just look closely at the core/ end sheet. The two-row and three-row rads use the same end tanks so the two-row rad will have extra space on the end sheet. The four-row rads are fatter and require bigger mounting tabs. I just cut into my mounts and bent them wider, but my truck is pretty messed up. A full shroud will help if you don’t have one.
Price a new copper four-row rad then look at Summit Racing’s two-row aluminum radiators. The Aluminum rads out cool the copper rads hands down. Take off the radiator cap and look inside. From front to back you can count the number of rows. I you do not have shroud (most Six’s did not have a full shroud) you can just look closely at the core/ end sheet. The two-row and three-row rads use the same end tanks so the two-row rad will have extra space on the end sheet. The four-row rads are fatter and require bigger mounting tabs. I just cut into my mounts and bent them wider, but my truck is pretty messed up. A full shroud will help if you don’t have one. Price a new copper four-row rad then look at Summit Racing’s two-row aluminum radiators. The Aluminum rads out cool the copper rads hands down.
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
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#5 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
Will look inside. I did get a shroud for it last year. Like I said, this happens mainly on the highway, and when it's high 90s-100s outside. Once I get the rpms and speed down, the temp starts falling again.
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#6 | |
Damn Yankee
Join Date: Feb 2007
Location: Lynchburg, VA
Posts: 2,261
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Re: radiator size differences
Quote:
I'd try a simple system flush, new coolant, and a new thermostat before buying a different radiator. If it doesn't fix it you can recover the coolant for reuse anyway. Last edited by jb4short; 08-24-2007 at 01:03 PM. |
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#7 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
I have a stat, but the truck didn't have one when I got it...I have a 165 in there, maybe need to go up to 185?
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#8 |
Damn Yankee
Join Date: Feb 2007
Location: Lynchburg, VA
Posts: 2,261
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Re: radiator size differences
You said it was originally a 6cyl....was the motor swap done when you bought it? If it was and the PO was running W/O a thermostat then this might not be a new issue
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#9 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
yes, swap was already done. this is only a late summer thing. today it got around 210 on the highway, which, to me, is high. Maybe not? Either way, it should be running a little bit cooler I would think.
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#10 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: radiator size differences
Just for grins, check the lower radiator hose to make sure it hasn't collapsed on you. I had one doing the same and found the coiled wires inside had rusted and the higher suction at high speeds would collapse the hose...
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#11 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
Okay, I'll check that too. Just replaced it about a year ago or so.
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#12 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: radiator size differences
Forgot to mention... not to scare you, but I also had another car that would act up similarly and it turned out to be a leaking head gasket. The higher speeds created more pressure and it would slowly force hot gasses into the water jackets (thats the way the mechanic explained it to me). We found that one by doing a leak test.
If it gets bad enough, it will suck up water into the engine when it cools off and you can see it when you start it up after sitting for a while and or loosing coolant. |
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#13 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
I don't think it's that bad, but you never know. Thanks for the heads up.
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#14 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: radiator size differences
you have plenty of air flow at speed (stick your hand out the window, you'll feel it
![]() You (most likely) either have a coolant flow problem, or a detonation problem that you can't hear at speed. |
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#15 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
Longhorn Man, what would cause the detonation problem? Incorrect timing or something like that?
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#16 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: radiator size differences
that, or runing too lean
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#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: radiator size differences
or too much carbon build up in the combustion chaimbers
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#18 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
If carbon build up, is there anything to help w/ this w/out a teardown?
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#19 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: radiator size differences
warm up the engine, then up the throttle to about 2000 RPM.
Take a bottle of tranny fluid, and slowly pour it into the carb. If the RPMs start to drop, you're dumping too much in. It'll smoke like crazy, but this cleans it out. |
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#20 |
Registered User
Join Date: Oct 2006
Location: Springfield, MO
Posts: 375
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Re: radiator size differences
okay, I'll have to try that. Thanks, again.
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1969 C/10 swb, 350, powerglide (daily driver) 2005 CRV (wife's ride) |
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#21 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: radiator size differences
tranny fluid or water (both done the same way) seafoam you can do the same way but once its all in you want to shut it off and let it sit for 5-10min then start it up again till the smoke goes away
and 210 aint really that bad
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-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#22 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: radiator size differences
no, 210 is ideal for engine longevity.... but can hurt performance.
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