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Old 05-18-2012, 06:00 PM   #1
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Running Hot

Hello, I have a 66 coupe with a 302 bored 40 over, I have a four core radiator,shroud,new water pump,6 blade fan, electric external fan controlled manually. if i drive on flat surfaces it seems to run fine, if i pull the grade from town to my house ( 4000' to 6500' ) it will boil over. any suggestions, Thank you in advance
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Old 05-18-2012, 07:46 PM   #2
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It could be the thermostat or someone might have installed the head gasgets backwards
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Old 05-19-2012, 01:45 PM   #3
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Re: Running Hot

I have checked the thermostat, I guess i would need to pull the heads and check the gasket, how will i know if its on wrong, will it be obvious?
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Old 05-19-2012, 09:37 PM   #4
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The gasket is marked front but if you can't read it, there are holes on what should be the back part of the gasket that are not on the front... I hope this makes sense
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Old 05-21-2012, 04:56 PM   #5
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Re: Running Hot

At 6500" altitude, the lower atmospheric pressure will make water boil at a lower temperature. Are you sure your system is pressurizing? You don't say if you installed a new cap of the right pressure (but I assume you did). And, did you put a 50/50 mix of coolant/water? Straight water and low system pressure at that altitude would be a problem.
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Old 05-24-2012, 10:47 AM   #6
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Quote:
Originally Posted by matcox83
At 6500" altitude, the lower atmospheric pressure will make water boil at a lower temperature. Are you sure your system is pressurizing? You don't say if you installed a new cap of the right pressure (but I assume you did). And, did you put a 50/50 mix of coolant/water? Straight water and low system pressure at that altitude would be a problem.
This sounds the most reasonable to me. I really can't see a headgasket problem. A good radiator cap and new coolant at the proper mix. You didn't mention if the radiator has been cleaned. Could it be partially plugged?
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Old 05-30-2012, 07:09 PM   #7
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Originally Posted by mike Franklin

This sounds the most reasonable to me. I really can't see a headgasket problem. A good radiator cap and new coolant at the proper mix. You didn't mention if the radiator has been cleaned. Could it be partially plugged?
You might also check timing and values to see if they are to tight
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