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Old 06-07-2016, 05:28 PM   #15
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How hot should a Chevy 454 run?

Originally Posted by Cody winkler View Post
It tends to run 215-220 on the highway and in traffic it runs about 225-230, I'm think of running a lower thermostat

That can be counter intuitive. The thermostat's function is maintains a minimum operating temperature. The maximum is a function of the capacity of the system to remove heat. It actually works more efficiently at higher temperatures. The maximum operating temperature is dictated by the heat being generated by the engine and the systems capacity to remove that heat.

If it were 70 degrees air temp and the water in the system was 70 degrees no heat would be removed. If it 70 degrees air temp and the water temp is 200 degrees heat is being removed. At 240 more heat is being removed. It's a self regulating system until the capacity of the system is overwhelmed. Increasing it capacity to remove heat or making less heat is the solution. Oil and transmission coolers can help.

As engines wear they become less efficient, making more heat and less power. Radiators corrode and become less efficient at removing heat. Clutches slip and create more heat. Torque converters make a lot of heat if the engine isn't producing the torque to keep them locked up.

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Old 06-08-2016, 02:17 AM   #16
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This is what the inside of my 84 radiator looked like. I took it to a radiator shop and they said it was a reaction of the lead, brass and antifreeze and they did not have a flushing agent that would remove it. The best they could do was manually remove what they could. Otherwise it would need to be re-cored.
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Old 06-08-2016, 04:10 AM   #17
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Using distiller water will prevent a lot of that corrosion.

Tape water has minerals that cause it to conduct electricity. The heat differential across dissimilar metals with tap water as an electrolyte cause galvanic reactions that scavenge metal from one source and deposit it on another. That's the majority of that gunk you see. It's not from the minerals in the water per se.
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Old 06-14-2016, 05:25 PM   #18
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the temperature reaches 190 210, I have climbed on a second fan that reduces the heat
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Old 08-13-2016, 01:18 PM   #19
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Are you sure your water pump/belts are fully operational?

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Old 08-13-2016, 02:19 PM   #20
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It is a good idea to have the radiator roded and cored at least every 10 years. The radiator can not transfer heat if it is covered or clogged with crap.

In the old days coring did not mean replacing but rather removing the caps and passing a rod through every passage. Today it may be cheaper to just recore the thing or id it has plastic end caps replace it completely. If you replace do it with a radiator with an additional row.

220 degrees in the summer and with the AC on is not that hot. The tell tail is does it drop quickly as you go down the other side of the hill. If it drops as fast or faster than it climbs the radiator has capacity. If not it needs help.
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Old 08-13-2016, 06:50 PM   #21
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I drove big block Chevy 1 tons for 15 years and they consistently ran at 210 in Texas year round if that 325 runs between 180 and 220 depending on the conditions...

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