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Old 08-18-2019, 09:13 PM   #21
drolston
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Default Re: Finally got it to not overheat!

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Originally Posted by Dodge View Post
We just did the same thing. The motor is a 276 cu. in. With isky max one cam and Motor City Flathead heads. It has a B&M blower and Holley fuel injection.
It also ran hot with a new aluminum radiator in it so the old copper one went back in, no
More problem. Go figure.
If a $200 aluminum radiator that looks great, fits perfect, and is rated for 500 horsepower seems too good to be true …. you know the rest. That Champion rating must have been for sub-zero air temperature and a NASCAR cooling fan.

And another thing: I found one of the mounting ears broken off when I took it out. It had been properly mounted with rubber pad, spring bolts and correct top braces.
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Old 08-19-2019, 06:07 PM   #22
Royal Ryser
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Default Re: Finally got it to not overheat!

Not a flathead but same topic. My 56 Thunderbird was heating badly after not being run for about 4 years. Before I found the problem, I did the usual. Flushed the whole system best I could, took out the thermostat, installed a new water pump, and checked the timing, all to no avail! So the I did what I should have done to start with. I removed the radiator and took off the top tank and tried to rod the tubes. I could only get the rod through about 2/3 of the tubes. So, I took off the bottom tank and worked on the tubes from both directions. Got all but 2 tubes cleaned out. Then, I bought some stop-leak just in case and soldered the tanks back on. No leaks! The car has since run cool as can be, with a t-stat installed.
I think I learned that the radiator was clogged up because I hadn't driven the car for a long time and the coolant had no rust inhibitor left in it. The block apparently shed a lot of rust over time, and clogged it up.
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