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Old 06-06-2016, 06:09 AM   #1
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How hot should a Chevy 454 run?

How hot should a Chevy 454 run?
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Old 06-06-2016, 06:54 AM   #2
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Depends on the thermostat.
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Old 06-06-2016, 07:12 AM   #3
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Considering the age I would suggest having the radiator cleaned and cored. The thermostat can not make up for lost capacity in the radiator.

Remember if the engine is running hotter than normal so is the trans and that is not desirable.
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Old 06-06-2016, 08:13 AM   #4
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Mine (SOB) runs 190 to 200 in heavy stop and go traffic up to 215 the 454 tends to run hot.
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Old 06-06-2016, 09:01 AM   #5
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The engine temps in my 345. Tended to run around 205. 210+ when working hard. With the fan engaged way too much.

Went thru the coolong system. Record the radiator, new turmostate. Hoses etc.

Now runs around 192 unless working hard. The goes up to 200 but the fan running brings it right back down.

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Old 06-06-2016, 09:20 AM   #6
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Forgot to mention if you are running what you feel is hot is the clutch fan coming on? They are the safety but have a very big range of acceptable on temperature. The factor spec list them as coming on from 165 degrees, air across the clutch not water temperature, to over 200. All clutch fans I have ever had come on below 220 degrees, as measure with a good after market gauge not the dash board gauge. Again that is air temperature not water.
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Old 06-06-2016, 09:32 AM   #7
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I have been worrying about my engine temps in my 84 Excella 270 ever since I found corrosion at the ends of the radiator tubes.
When traveling, I have a tendency to overload it and now I am pulling 2000 pounds of trailer behind.
I used a data acquisition program and thermocouples to monitor my last trip home on I90 Springfield exit heading westbound to NY
The attached graph tells me I am doing OK with the water temp steady just below 200.
One note, the dash water temp gauges are not accurate. Mine reads 20 deg higher than what I read on the thermocouple probe and the ECT readout of the TBI computer.
My fan clutch kicks in way to often on hills and even flats when the outdoor temps are 80 or higher, that fan sucks up horsepower.
Note my temps inside the cab are higher than outside, I dont run the AC.
The small glitch in the chart was a fuel stop at the Lee service plaza
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Old 06-06-2016, 10:08 AM   #8
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My 250 runs 180 pretty much all the time. If I'm in town or going up hill the temp rises a little, the fan clutch kicks in at 200. Touch wood, it's been very reliable since in installed a new fan clutch about five years ago.


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Old 06-06-2016, 10:31 AM   #9
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According to owners manual for our 1984 310, normal operating temp is 190-240F.
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Old 06-06-2016, 12:39 PM   #10
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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
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Old 06-06-2016, 01:03 PM   #11
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Adding a good transmission oil cooler will help both the trans and engine temp. The transmission does a great job of adding to radiator temp.


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Old 06-06-2016, 01:37 PM   #12
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Quote:
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
Test the thermostat before replacing it. Sounds like you need a radiator cleaning. Lowering the stat will do nothing if the capacity of the radiator is not there.
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Old 06-06-2016, 01:55 PM   #13
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You definately do not want to run your trans too hot, otherwise you'll be in for a hefty bill
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Old 06-06-2016, 05:04 PM   #14
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Yea the transmission was really expensive blew that in Pensacola, I pretty sure it's a faulty thermostat cause it only happens on occasions and we rinsed the radiator, it was running 235 constantly so we replaced the radiator cap which helped a lot, it's very possible it could have a thermostat for up north cause that's where it spent most of life displaying de Howard's power steering system
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