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For the FE guys, cylinders 1,2 &3 Overheating

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Old Nov 29, 2011 | 07:34 AM
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Default For the FE guys, cylinders 1,2 &3 Overheating

Got a problem, need help from more learned folks. Just got through rebuilding my 390GT out of my 67 Cougar. It's been bored .030 over, balanced, new valve train, heads have been port matched and polished, Canton windage tray, new Edelbrock Performer 390 intake. Started it on a break-in stand. Noticed the left bank getting hotter than the right bank, can't even stand to touch the valve cover for very long, even the spark plug boots are too hot to handle. Pulled out the old Inferred Thermometer, #1 was 750F, #2 is about the same, #3 is 800F while #4 - 8 are running about 600F to 650F. Intake vacuum is running between 14-17 and reving to about 20 in/Hg. Pulled the valve cover while running and sprayed a little carb cleaner around the Intake Interface to look for leaks and got no engine rev. Could a backwards head gasket cause this kind of problem? Everyone I've talked to has never heard of just three cylinders running hot like this. I've got 120 PSI on all the cylinders. What's up. I've checked the head gaskets and they're installed correctly. Can anyone please help.
 
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