('84 CJ7) A few years ago when I swapped in my 401, I left the stock 6cyl radiator in to handle cooling. I never ran into a cooling issue that I could see, It ran a bit warm at times but never overheated.
Im rebuilding the block at the moment so I have everything ripped apart. If I need to upgrade my radiator, now would be a good time.
For those that went from a 6cyl to a v8, what did you do for a radiator? Stay with the 6cyl rad? Custom radiator? Radiator from an earlier V8 equiped CJ?