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Old 05-08-2007, 07:26 PM
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Fresh 383 overheat

Just installed a fresh build 383 stroker and have a water temp. problem. Engine has less than 100 miles on it and water temp gauge cycles from 190 to 230 after five to ten minutes of normal operation. Temp does not stay at 230. After a minute or two it drops back down to 190. Will stay there for five to ten minutes and the start its climb. It does climb higher if clutch is depressed while rolling at highway speed at idle. Did all the checks to verify if heads were cracked. All were negative. Even changed the gauge(mechanical). Radiator is a new Griffin down flow. It appears to be working, top is hot, bottom is cooler. Any ideas would be greatly appreciated, thanks

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Old 05-08-2007, 08:23 PM
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Doc here,

You have an air bubble trapped in the system and need to burp the system.

Slightly rise the front of the vehicle, Fill the radiator, Install a lower than normal pressure cap. (IE: if it has a 17 lb Cap put in a 10..)

Fill the Coolant recovery kit..AND KEEP it full during the process..don't let it run dry..

Start and warm the engine, Monitor the temp, Do Not let it overheat!

As it runs and the thermostat cycles, it will blow air out into the coolant recovery tank, and withdraw coolant to replace the air. Let it do this until it no longer is expelling air..

It looks and sounds terrible..thumping and back-blow, but it is normal..don't let it worry you.

After it no longer is blowing off air, shut it off, let it cool, then replace the cap with a proper sized cap..

That should stop the excursions on the gauge.

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Old 05-09-2007, 05:08 AM
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What doc said...... just went through the same thing on my Monte only for different reasons, the recovery tank is going to shake like a rabid woodpecker and make rude noises for a few seconds. It will eventually come out of it, like doc said keep the tank full. I stood there with a garden hose until it was done. I get to go through the whole thing two more times.
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Old 05-09-2007, 06:50 AM
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Will pick up the 10lb cap today. I tried to eliminate air the first time I filled it by tilting the engine and filling the block through the thermostat, one cup at a time. Guess it wasn't slow enough.

Thanks for the responses.
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Old 05-09-2007, 05:09 PM
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Did you end up fixing the problem, my symptoms are almost exactly the same.
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