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Which type of coolant?

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Old Jun 25, 2018 | 12:22 PM
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Default Which type of coolant?

About ready to fill the radiator on the resurrected '72. Have a new ZZ502+Al radiator. Do I use Dexcool or the green stuff? OAT or something else?
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Old Jun 25, 2018 | 12:31 PM
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I’d use the green stuff, the premixed 50/50.
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Old Jun 25, 2018 | 02:00 PM
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dont waste money on 50/50 premix garbage.

buy a gallon of straight cheap stuff (usually like $10 on sale), and if you are really concerned about the tap water quality in your area, buy a gallon distilled water at walmart, its like 98 cents.

you get 2 gallons of 50/50 for $11, instead of paying the same for 1 gallon of premix.
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Old Jun 25, 2018 | 10:59 PM
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I am personally no expert on antifreeze, but based on what I have read on the NCRS forum, I am going to use Zerex G-05 in my 70 big block I am restoring. It is better with any solder joints you may have, and I have not read of any downsides to using it. I used Zerex G-05 in my 69 L46 I previously owned, and it performed well.
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Old Jun 25, 2018 | 11:17 PM
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Originally Posted by 00Nassau
I am personally no expert on antifreeze, but based on what I have read on the NCRS forum, I am going to use Zerex G-05 in my 70 big block I am restoring. It is better with any solder joints you may have, and I have not read of any downsides to using it. I used Zerex G-05 in my 69 L46 I previously owned, and it performed well.

I run G-05 in all my cars, including my CL55 AMG.
Great for cooling systems and engine bits that are aluminum.
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Old Jun 26, 2018 | 05:39 AM
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Im in Florida i dont run antifreeze as it doesnt freeze here,
I run water, not tap water, well my tap it has a special filter,
Before anyone gets in a tizzy i do use an additive to lube the water pump and pervent corrosion,

For those who want a plug and play pre mix seems popular but yeah, mix it yourself and save a buck

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Old Jun 26, 2018 | 06:34 AM
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When you buy premixed, you are paying 10 bucks a gallon for water. A 502 is a big block Chevy. You can run salt water in them for 15 years before getting corrosion issues. I know lots of guys who do. Some spend 15-20k on 750 hp 540's and run raw ocean water for coolant cuz 50-75 lbs closed cooling system is too much extra weight. Antifreeze type is not a major consideration.

Last edited by derekderek; Jun 26, 2018 at 06:40 AM.
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Old Jun 26, 2018 | 10:21 AM
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You can look into EVANS coolant also. Go to their website and watch the video with Jay leno...for whatever that is worth.

Some of my customers choose to go with it and some choose to use conventional anti-freeze.

DUB
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Old Jun 26, 2018 | 10:27 AM
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Originally Posted by MBrianB
About ready to fill the radiator on the resurrected '72. Have a new ZZ502+Al radiator. Do I use Dexcool or the green stuff? OAT or something else?
Does it ever freeze where you live? If not, I'd suggest just running straight water with an anti-corrosion package. Water has a much higher heat capacity than antifreeze.
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