Alright, Rich... even though you'll ignore me, I'll try to help you yet again.
A 4 core desert cooler should have no problem cooling a mild 400. Changing to an aluminum radiator is not going to make much of a difference. If you are not running a thermostat or restrictor then the water is just cycling through your radiator too fast for it to transfer the heat out of it.
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1966 GTO
1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60'
1969 Bonneville Safari- cross country family cruiser. .
1979 Trans Am 400, 4-speed, 4 wheel disc.
View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A
Ride along in the other lane- http://www.youtube.com/watch?v=mIzgpLtF_uw
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