Well in spite of of some garbage deposited I can gleam off the good. The fact is some didn't seem to read what I originally posted. The original 4 core HD Tri Power Rad worked and cooled fine with the 389 and has for me since 1977 when I bought the car. This is NOT my first Pontiac . I bought my first GTO in 1974 a 67 Ram Air car it constantly ran in the 200 * range . It took me some time to figure out that it needed a fan shroud. In the years time fame I had dragged home at least 20 more A bodies some of them had shrouds so I started experimenting first thing was to ditch the T stat not too much help there but as soon as I added a shroud to the GTO I dropped 15* on a normal day . Over the past 37 years I have owned 21 or 22 GTOs and close to if not over 200 A bodies . I have mixed and matched late and early both ways over that time frame .I have a 64 389 with 48 heads on it no issues , a 428 with an early wrap and no issues and have had several other combos all on good old copper cooling systems with no issues . I guess I was just looking for some quick knowledge here . I had a cooling system that was working fine the variable here that I'm leaning to is the 65 intake it's the only given I had no prior information on. I had the 455 running in the Bonnie before I pulled it I started it and ran it for three days before I pulled it ran 15 gallons of fuel through it idling it and running it. though it didn't have gages the idiot lights which worked didn't come on for overheating. with the original 4 v intake the motor ran smooth as silk no surging etc. all the other components related to the swap were working fine in the previous application .There was a mention of the carbs to the 455. It runs like a raped ape It will melt the tires in 1st and 2nd no problem with fuel delivery . I'm looking for a vacuum leak. I did a quick test the other day with a small torch because my big tanks are empty at the moment have to get them filled. If I have a vacuum leak it will run lean causing an over heating problem. I don't have any more latter tri power intakes only 64s so I'm at the point I'm going to pull a unit I know is good and switch it. If that cures the problem then I have to check gaskets or look for a crack in the intake or choke tubes .One more note I am back to the original water pump took off the re man and ordered in a new one but both of those had shorter impeller fins than the original by about 1/4 inch .Thanks to all that have responded
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