tkcutlass

Going through my parts collection I located a 3-row radiator will that be sufficient to cool a stock 455 build with A/C?

Phoenix8990

I did radiator repair in the 70's and from recollection I would say that would work ok. If you lived in Arizona or a similar climate I wouldn't be sure. Or if it's 105 and you have the air on. But for typical NE weather you should be fine.
Steve

Phoenix8990

PS, give it as good a flush as you can with a hose. Visually check inside to see if there is any build up on the tubes or remnants of leaks showing on the outside. If so you probably have it hot tanked and rodded out. That's if there are any shops that do that any more.
Steve

lunaboy

That should work fine with a good thermal fan, but i would have a temp guage added with the 455 or
IF YOUR CAR HAS A/C AND A 455 YOU WOULD WANT A 4 CORE LIKE THE FACTOR PUT IN FOR HD COOLING CARS . yOU CAN ALLWAYS GO ALUMINUM AND ELECTRIC FANS.?
you could open the cradles a little AND INSTALL 4 ROW. i HAPPEN TO HAVE NICE 72 STYLE SIDE CAP 4 CORE TANKS LIKE YOUR 3 CORE PIC IF INTERESTED.

RocketDevo

Having a fan shroud for a 455 and AC would be recommended.
Along with a clutch fan as others have pointed out.