FYI - I always had rusty coolant when I first bought my car. Then the heater core let loose a few years later, and it hasn't been a problem at all since.
I never flushed it without the radiator in place, so can't help you there.
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 1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.
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