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#41
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Now go another step. The core I have installed now between my original upper and lower tanks is still a 3 core, but called an SLK core, which is comparable to an OEM 4 core GM radiator. And it's made up in Philadelphia, PA USA. This core is copper with 3/8ths inch spacing between the tubes. Yes, I measured it. I've no idea as I did not count the number of tubes in my original OEM 3 row core, but this core has 168 tubes and too many to count extra fins. I am now out of this topic unless it goes back on the topic started by Don. The eyes are watching..... So with that....
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Gary Get in, ShuT Up, Hang On! Member of the Baltimore Built Brotherhood MY GTO built 4th Week of March 1966 "Crusin' Is Not A Crime" Keep yer stick on the ice. |
#42
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#43
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I put an aluminum rodney red in my overheating '69 GTO in around 2003 - it made the car run cooler..
In around 2006 I put a recored brass/copper? radiator in my 70 GTO (cost about the same - around $400).. but ordered the higher performance version that had denser fins per inch... Rebuilt motor was overheating badly prior to the recore - after the recore - beautiful temps all summer long in San Diego - no doubt this high performance copper/brass recore can handle it. I'm now in the "no need for aluminum" camp.... I think a lot of folks fail to recognize that radiator performance degrades with age... People are wondering why their cars overheat, and even though their radiator isn't leaking, its not cooling like it did when it was new. I spent months chasing timing, impeller clearances, thermostat temps, etc - it all seemed to just nip at the heals of the problem. Replaced the radiator and BAM!, temps dropped 30 degrees on the highway. Regarding this 389/455 issue, its very possible that the current radiator's performance is degraded, but its still adequate to cool the 389. However, another 15% engine displacement is enough to tip things over... All the engine has to do is generate 1% more heat than the radiator can reject, and that 1% quickly builds up. - Or is could be something else - My two cents
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1969 Judge, 4-speed, CR/Parchment, Quasi-Survivor, #'s match - under restoration |
#44
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No, it was mentioned...just fell on deaf ears.... |
#45
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It takes a custom core like mentioned above (high-efficiency spacing, large(r) tubes) to equal OEM cooling (comparing copper-brass). Your original OEM core will have 39 rows, with 3 tubes per row. The tubes are 1/2". An OEM 4-row will have 156 tubes, so the SLK core 3-row has 12 more ! |
#46
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just to report back my results, after it's all said and done the replacement clutch fan was bad. it cost me a good running motor and a month of screwing around . The 0riginal 47 year old 4 core is in and running at 190* .
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#47
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Lead solder has no functional effect on thermal conductivity, which is the whole thrust of this thread.
Copper or aluminum, if the rest of the cooling system isn't up to the job, it won't matter WHAT type of construction your radiator is. The two main factors are the mass of air going over the core, and the amount of fin surface area created by the core. The thermal conductivity of brass/copper -- a denser metal than aluminum -- will have some effect on how well it transfers heat to the surrounding air, but it will not be the deal breaker, all other things equal. Anything that helps drain the heat in the water into the surrounding air will help, including water-wetter, shrouds, a properly sized fan, a proper verified fan clutch, and above all the correct clearance between the plate and impeller which maintains proper water flow. FWIW, when thirdgen F-bodies were having problems with high underhood temperatures (yes, even in the late '80s carbed engines were still having hot soak issues) the '88 or '89 Firebird switched from a smaller lightweight aluminum radiator to a larger copper-brass version, cost and mass be damned. When they did, they pretty well eliminated the warranty issues for hot running and overheating. |
#48
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Just curious, how did you verify the clutch fan was bad?
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1973 Formula 400 4 spd 04C build date Norwood assembly plant. |
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