Any help would be appreciated with my problem. So here it is, I had my 440 rebuilt by very knowledgeable mechanic in my area. Had it completed last fall and started it which was last October, didn’t have a chance to put any miles on it but everything seems to be good, cam was broken in, oil pressure good, water temperature was normal. Started it two weeks ago, started fine but temperature went above normal, inferred temperature reading above 200, no trapped air in the system, thermostat was opened. Was shut off, let it cool and started it again and same thing. Replaced with another 180 thermostat thinking this was the problem. Started it again, same problem, both thermostats were checked in hot water to make sure they opened up, which they did. Replaced fan clutch, didn’t help. I have the high capacity water pump, which was rebuilt.
440 overheating
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Get a manual temperature gauge that you could put in the radiator as the thermostat opens and see what your temperatures are I understand the infrared and what you're doing but the proper way to know temperature is to see what it actually is what type of water pump was used six blade or eight blade what type of fan do you have on the vehicle mechanical or electric these are some of the answers we're going to need
That really doesn't tell me what water pump you have there's either a six blade or an 8 blade so I don't know which one you have you need to take a manual reading of the temperature of the coolant you know like that thermometer you use in the oven or if you have a temperature probe for your multimeter that you could put into the coolant and see the exact temperature if you're idling and the car is a 200° in 10 minutes that's not good but you do need to drive the car and see what the temperature is it's more important I get to 200 sitting at a light so it's 95° here in Florida with about 80% humidity so these are the information we need from you to help you sir
You're using street slang and that does not help there's a heavy duty Cooling and there's a standard Cooling the two different water pumps if you don't know I understand maybe the temperature gauge is reading different and you're overthinking this this is why I'm telling you to take a manual reading while it's sitting there idling and you're watching the coolant go through the radiator you stick the temperature probe in and you see what the temperature is trust me I just had to replace my temperature sending unit for the dash because it acted up and it tested bad but you'd have to read the service manual to understand the testing instead of guessing
I know I got the heavy duty water pump, there’s a person that’s helping me trying to help diagnose the issue with the same exact car and engine as mine. His car is next to mine while both are running. His temperature on his stays constant as mine slowly increases to the point where I need to switch it off using infrared thermometer
Russ69Runner
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Have you cleaned the radiator. Are you running cast iron heads. I went with 440 source heads in my 383 motor. After a mild rebuild it wanted to get really hot. The old heads where cleaned but they don't have large water ports like the new aluminum head,s
Russ69Runner
Well-Known Member
One more thing is if your running radiator fluid too quickly through the system it will not have time to cool off like it should.