OldmanMopar posted this a few years ago, and I'm convinced I experienced it........
He claims that age, thermal cycling, "whatever" can cause the finds to crack loose from the tubes. Looking at the rad, you see nothing, it doesn't leak, and the tubes may flow fine.........They simply don't transfer heat
I had the original 67 2 row checked by a rad shop, they claimed it would "cool anything I put in the car." A stockish 360? Not so much, and later a 318. So in my travels I had a used "unknown" condition 73/74 2 row out of a slant. One summer day I threw that in there "just to see." The change was DRAMATIC
Don't know, but you might "tuck that away" back there somewhere
