[67cruiser]

My bracket car, 67 GTO 90 outside runs at 190 degree,s, i have a 2 yr. old 4 core radiator running red keep cool no thermostat with factory 6 blade clutch fan. Thinking about a new aluminum radiator to run a little cooler. WORTH THE INVESTMANT?????Who has best deals going right now???

[Chris65LeMans]

I'd personally be happy with the numbers you've got now. A new radiator won't be too much of an investment, but there's always the chance that you'll still run the same temp.

[pontiac 455ho]

190 is a good temp. Don't want to run to cool or the fuel does not burn as well. And I went with the milodon high flow water pump. Not shure if they makes it for the 8bolt pump

[TheSilverBuick]

I wouldn't mess with it. A 2-row aluminum radiator will do a tad better, but not really much better than a good 4 core brass-copper.

[67cruiser]

Thanks guys, really was thinking about a 3 row, maybe

[chiphead]

I bought one of the aluminum 2-row rads from PY. It fits and works very well. I was running a used 4-core desert cooler that had been rodded out twice and was still running 205-215. I did all the cooling mods and was still running 200+ After I swapped to the aluminum, temps went to 170-185 with 160 t-stat in 90* weather.

I would try the other cooling tips first, 190 isn't a bad starting point. 160 stat, fan shroud, 7-blade clutch fan, divider plate clearances, etc will get you where you want to be. You're only 10-15 degrees above ideal anyway.

You gotta understand that the '65-67 downflow radiator and 8 bolt pump has several design issues. It's not gonna cool like a big 70-newer crossflow radiator and 11 bolt pump. The airflow, water flow and cavitation issues plague us first-gen A body guys. It's the nature of the beast.

[68blackbird]

For a bracket car I would recommend spending your money on an electric water pump like a meziere and electric fan. This way you can wire everything to cool the car off after you shut the car down in the pits. My two cents

[Nicks67GTO]

I run a 455, 11 bolt napa cast impellor pump properly clearanced, 160* stat, stock clutch fan with the Napa HD clutch, and an aluminum radiator and im consistantly at 175* in the heat. I almost got to 180 the other day driving when it was hotter than blazes out. I personally wouldnt have a stock 4 core harrison on anything I owned unless it was a nut and bolt restoration....in which case I would see if I could have someone braze a Harrison tank to a black annodized aluminum radiator. This whole arguement reminds me of the 3/8 vs 1/2" line arguement. Yes some guys get it to work but it just seems like for the little amount of $ you can have something you know is going to work better.