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Old 11-24-2019, 09:55 AM   #1
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Original Radiator

I was planning on using my original radiator in an LS1 swap into a 1963 GMC. I have been told the original radiator will work fine. I have also been told I need an Aluminum Horizontal core radiator.

Any personal experiences I can learn from ? Any thoughts ?
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Old 12-16-2019, 02:50 PM   #2
Factory Guy
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Re: Original Radiator

From what I understand you can/should use the original (if it will fit).
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Old 01-20-2020, 12:17 PM   #3
dean jendro
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Re: Original Radiator

I used this one. Installed 3 years ago with no problems.
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Old 01-24-2020, 10:23 AM   #4
Custom 68
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Re: Original Radiator

I used my original one for years. I did recently swap to an aluminum one. Not a real expencive one but I thought it might be better since I get into traffic during the power tour or CTC.
My original was good but the newer ones seem to flow better and I did get some better cooling. I would just run what you have and watch the temps.
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Old 02-02-2020, 10:13 AM   #5
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Re: Original Radiator

When I did my Jimmy about 10 years ago I had a radiator shop make some changes to my stock AC radiator. He added a steam port and IIRC changed the size(s) of the hose bungs?

Worked perfectly until I sold the Jimmy.
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Old 02-06-2020, 04:48 PM   #6
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Re: Original Radiator

I swapped an LQ4 into my 72 C25 and kept the factory radiator. I have not had any problems here in Colorado.
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Old 02-10-2020, 01:12 PM   #7
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Re: Original Radiator

Unfortunately, I never had the original radiator although I think it would've worked. I ended up going with a 26"x19" crossflow aluminum radiator from Northern and was able to keep the upper and lower hoses on the passenger side. Ran it to CTC back in October with new Vintage Air system and worked great.
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Old 03-13-2020, 05:01 PM   #8
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Re: Original Radiator

Moved to the ls swap forumn
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