[Steeveedee]

I don't really remember, I was just worried about the high temps.

I worked for Chevrolet dealers on and off in the early '70s. I remember the '71 SB400 engines, even in the big wagons with AC, were getting 2-row radiators. We had a bunch of them in the service department with toasted engines, getting retrofitted with bigger radiators. I don't remember if they simply replaced the engines or rebuilt them, but some of them were pretty crispy inside. So GM built some marginal cooling systems on occasion.