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Old 03-12-2008, 06:43 PM
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Needs some help! I have a 65 chevy nova II with a 283, and it its running to hot, has new 4-core radiator, new thermostat-160, new water pump. i tested the thermostat before installing and it worked well. Temp is climbing all the way to 210, and not coming down, could i possibly have a craked head gasket, any help would be helpful!!!

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Old 03-12-2008, 07:14 PM
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Hi, and welcome to the HR forums!

First off, 210 is not hot. I know it's not what you'd expect but it's not that hot.

Having said that, what kind of fan do you have? Do you have a full shroud on the radiator?

A good thermostatic fan clutch and shroud will help make good use of that big radiator.

Have you verified that the guage is accurate too? Sometimes the sender goes wacky or the guage reads wrong.

Just some things to check.

Mark
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Old 03-12-2008, 07:18 PM
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quick checks

there are several ways to check for a cracked head/blown gasket.
is there chocolate milkshake water in the oil pan?
can you see large bubbles in the coolant neck while running the engine?
weird white/brown nasty buildup on the oil cap underside?
have access to a coolant pressure tester? just pump it up and come back in ten minutes-no coolant on the ground, but lost pressure, is a good indicator of a leak.
you could also go get a block check, a fluid is placed in a tube above the radiator and the fluid changes color in the presence of exhaust gases coming out of the rad.
check the clutch fan, radiator cap, check for leaks in the system
i'd suspect poor ignition timing/carb tuning before i ran to "broken parts"
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Old 03-12-2008, 09:16 PM
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First off I owned a 66 deuce, had similiar problems,
1. you need a 180-190 t-stat (gotta slow the flow down in order for the coolant to dissapate some heat) use antifreeze mixed at 50/50.
2.You gotta have a fan & shroud to pull air across all them cores to perform #1
3. If you got headers they also put off a lot of heat under the hood,header wrap would help, headers are all right but they are a PITA.
4. check timing and make sure carb ain't lean.
5.If it gets around 240+ then worry, also set it up with a coolant recovery system (proper cap & recovery tank) this will keep it from getting low on fluid.
If it should puke some fluid out, it will draw it back in when it cools off.


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Originally Posted by nova1965
Needs some help! I have a 65 chevy nova II with a 283, and it its running to hot, has new 4-core radiator, new thermostat-160, new water pump. i tested the thermostat before installing and it worked well. Temp is climbing all the way to 210, and not coming down, could i possibly have a craked head gasket, any help would be helpful!!!
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