396/375 eng. temp. - Team Camaro Tech
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post #1 of 6 (permalink) Old Apr 20th, 03, 04:21 PM Thread Starter
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I have a 68 camaro with totally rebuilt 396/375 hp engine along with new 4 core rad,new hoses, water pump and 180 degree thermostate. the temo gauge is running between 210 to 220 degrees. should i be alarmed. the engine is not boiling over nor is it hard to start when at 210. the gauge i am using is a good quality set og gauges from summit..any ideas or is this not a problem.
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post #2 of 6 (permalink) Old Apr 21st, 03, 02:45 AM
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Do you have a fan shroud and a fan that fits it correctly? If the radiator and fan have enough capacity, then the engine should run on the t-stat. That is it should run about 180-185.

When is the engine at 210-220 degrees? Idling? open road?

This temperature really won't hurt the engine, new cars run at 225 by design, but you should find out why it's getting so hot.
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post #3 of 6 (permalink) Old Apr 21st, 03, 03:29 AM
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My 396 runs at 180ish. Standing still on a hot day in traffic it will creep up to 210-220.
Makes me uneasy too, I think its all in my head. This motor has been running for 10+ years so it must not be too bad.
Same basic combo you have. 4 core, 180 therm new alum water pump.
No shroud.


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post #4 of 6 (permalink) Old Apr 21st, 03, 03:41 AM
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When does it get that hot?

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post #5 of 6 (permalink) Old Apr 22nd, 03, 01:10 AM
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I suggest you install a Robertshaw or Mr Gasket (made by Robertshaw) High Flow thermostat. One can get these from any retailer selling MrGasket or Summit Racing.

You should have it run cooler, or you will have hot starting problems this summer.

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post #6 of 6 (permalink) Old Apr 22nd, 03, 01:38 AM
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First things first. Are you sure that the gauge is accurate? Have you calibrated in boiling water? Where is the location of your sensor, whereas head sensor locations can become heatsoaked with exhaust which experiences tainting and does not reflect true block/head temperatures. Intake location is the best consistent readout.

Even if the temperature is rising, I am assuming at idle or slow speed cruising. Temperatures that creep up while at highway speeds usually indicate either a lower hose restriction (no spring) or a too lean condition.

Engines that run fine on the cycling/opening points of thermostats at speed, yet rise during idle or slow speeds are indicative of lack of airflow at idle/slow speed. This is usually fan shround related. MOre airflow is needed to keep things in check. Temperatures of 210+ are not alarming, but instability is....in other words temperature rising and keeps rising!

What kind of fan setup do you have? Clutch fans are inconsistent in behaviour and can cause intermittent problems.

Changing the thermostat will not appreciably affect the running temperature (no disrespect meant to Everett!) The RS thermostat meantioned may help flow a smiggin, but usually is not a problem solver for rising temperatures.

For more on cooling ideas visit my techforum at Jack'Stands Cooling Forum
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