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Old 06-22-2002, 07:51 PM
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Post Head install problem on '93 Z28

I just installed a new set of ported heads on my '93 Camaro Z28. On the first fire-up, the engine got real hot really quick. I made sure that there was enough coolant in the system, but it still overheats very quickly. What could be the problem and and possible solution?

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Old 06-22-2002, 07:57 PM
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Check to see if you put your thermostat in backwards when you put the car back together. I did this once with the same results you had. Also were you careful to install your new head gasket in the same position the old one was? If you installed it wrong, you will have the overheat quick problem you describe.
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Old 06-22-2002, 08:25 PM
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I didn't have to take the thermostat out for my application, so I know that's correct. The head gaskets were also align by pins so they could really only go one way. I did have to dremel out two of the larger water jacket holes to match, but they matched up with the old gaskets pretty well so I don't think it's causing too much blockage. Are there any other possible causes?
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Old 06-23-2002, 02:50 AM
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could be a air lock,drive car over a few bumps,steep up and down hills and check the water level again ,maybe bleed the air from heater .
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Old 06-23-2002, 06:17 AM
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I tend to agree with HQ, belive you have got air pockets. Some of these cars are hard to bleed the system. Which motor is in the car? What kind of heards? Are you surethe head gaskets sealed/ just a thought.
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Old 06-23-2002, 10:39 AM
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You should have to bleeders, one on the thermostat housing and another on a heater hose i think. Take the radiator cap off and with the engine of loosen the bleeders and wait till it quits bubbling. Then tighten the bleeders and put the cap back on.
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Old 06-24-2002, 07:26 PM
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I ASSUME you had no overheating problems to begin with, you put the new heads on and now the engine overheats quickly. If you checked your new head gaskets up with your old ones and they were the same and you never touched the thermostat, that would eliminate those two. Here are some other ideas to check.

1. You could check to be sure the head gasget sealed by taking off the radiator cap on a cold engine, fill to top with water, start engine, check for bubbles in the radiator. If so there is your problem.

2. Slipping fan belt.

3. Carb mixture too lean.

4. Clogged eshaust system.

5. Late ignition timing. Centrifugal advance not working properly.

6. Check to see if impeller on water pump is turning.

7. Might try running it without a thermostat to see if that makes a differnce.

Let us know what you find out.
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Old 06-24-2002, 09:35 PM
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Just a thought, a small piece of gasket material stuck in the thermostat will ruin your day. Don't ask how I know this.
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