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Username Post: 1963 c10 radiator ?        (Topic#358059)
Posts: 3

Reg: 09-08-19
09-15-19 12:50 PM - Post#2775580    

Hey i have a 63 c10 fleetside i swapped the old 6cyl with a 350 and i still have the original radiator in the truck my question is do i need to swap the radiator or will the original cool off my 350. I drove it the other day and it got up to about 200 and the thermostat opened up and it dropped to 180. I though hmm its going to work but then it heated up to 220 right after that so i shut her down and was thinking about putting in a new thermostat but thought whawt the hell ill see if anyone has been able to cool off their 350 with the original radiator out of curiosity.


Silver Supporting Member
Posts: 397
Loc: West Richland, WA
Reg: 02-05-17
09-16-19 09:07 AM - Post#2775630    
    In response to 1963c10bb

I did a swap to a 327 with the original 6 cyl. radiator in my '65 at first, and it was marginal. Of course, there's several factors, including how efficient the motor is running, the fan being used, and how fast the truck is moving. In order to get the fan closer to the radiator, I had to put in a long water pump and a fan spacer. I ended up swapping to a bigger radiator a short time later. It was OK when the truck was moving, but if you have to wait in traffic at all, it would overheat.

Mel Foye 
*VIP* Original Founding Member Group
Posts: 4972
Mel Foye
Reg: 09-29-00
09-16-19 03:01 PM - Post#2775658    
    In response to 1963c10bb

Since your 350 is just under 50% bigger than your 235 you are asking a lot out of your original cooling system to start with.
Is the radiator in perfect shape?
Is the rear of the radiator enclosed with the fan blades 1/2 in?
Are you overdriving the water pump? Likely you should be.
Use a sheet of paper on the FRONT of the radiator, does the air movement pull the sheet SHARPLY to its face?
From what you posted I mainly think you have air in the system.


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