Fullback, I had the same problem with my 66 4speed GTO. Car now has a built 400 instead of the 389. But I still have the 389 block for it. I was never a fan of an aluminum radiator but decided to give it a try. I bought a Cold Case thru Ames at the last PY show... probably 4 years ago. Best thing I did. No overheating now. Tho it will hit 195 once in a while depending how long you have to sit waiting for a redlight to change to green. Some here are a long wait. And that's using a 180 thermostat.
IF I recall correctly, the original factory thermostats back then were 192.
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Gary
Get in, Shu T Up, Hang On !
Member of the Baltimore Built Brotherhood
MY GTO built 4th Week of March 1966
"Crusin' Is Not A Crime"
Keep yer stick on the ice.
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