From what I have noticed, a number of 65 GT350's have 2-65 and 3-65 date coded radiators. Most of the cars I have seen with these radiators are also in the 200's and beyond which makes sense with their production dates. I have never seen a G2 radiator in 11-64 or 12-65 but I have seen early Gt350 cars unrestored with Y2 radiators so this begs the question, when did the G2's start?