#81  
Old 05-11-2022, 11:50 AM
Gary D's Avatar
Gary D Gary D is offline
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Hi, First thing I would check is combustion gases/heat getting into your coolant system. I fought a heating problem for a long time and it turned out o be a bad block that had been repaired with a sleeve and I believe that hid the real problem. I bought a rebuilt 455 and had to rebuild it again. A bad Craigslist experience!! Long story short after trying every cooling combo available I finally checked for combustion escaping into my coolant and solved the problem. Destroyed that block as not repairable, transferred all my parts, problem solved. Just a thought!

  #82  
Old 05-11-2022, 12:42 PM
78w72 78w72 is offline
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Quote:
Originally Posted by alanmay0 View Post
Did the test for exhaust gasses in the radiator, could not turn blue stuff yellow.
Quote:
Originally Posted by Gary D View Post
Hi, First thing I would check is combustion gases/heat getting into your coolant system.

FYI: he has checked that

  #83  
Old 05-11-2022, 02:40 PM
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chemnick chemnick is offline
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I have skimmed through the posts and will offer this to you. I was in a similar situation a few years back and I can feel your pain. I tried a lot of things, but for me, two things were what did it. First, with the engine-driven fan (7 blade) and proper shroud, I went from a heavy-duty fan clutch to a severe-duty fan clutch. Secondly, I installed all the radiator seals and installed the stock front-end sheet metal baffles that go under the front end of the car. It was as simple as that. The seals for the radiator and baffles for the front end were stock, I believe on all 1967 GTOs with AC and/or HO. I screwed around with a lot of things, but it came down to airflow through the radiator and fan speed. BTW, my radiator is a 2-row aluminum from Ames. GOOD LUCK with your situation. I'm just an old knuckle-buster and not an expert by any means. Just trying to offer a suggestion or two............................................... ........
Chemnick

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