From what I have gathered, both the inlet and outlet are both 1/4 inch larger in diameter on the V/8 radiators. I was advised by both Auto City Classic and Engineered Cooling Products that the V8 and 6 cylinder radiators were different. Was disappointed that neither offered a 6 cylinder version because their V8 versions were very close copies of originals. I know companies like Champion offer cheaper alternatives , but they seem to me to resemble street rod radiators with tanks made of welded together flat stock aluminum.
