Apparently the powers that were in charge in CA in 65 felt that it was needed so that’s why you got it in 65 where the other 49 states got it in 66 or maybe 67
I am aware of that, and I am all for things that works. The PCV valve and system is the right medicine for a real problem. I just don't see the value of the hose from the oil filler cap to the air filter housing. If the oil filler cap had a valve, and it was air tight around the tube, and the PCV valve was air tight, and the carb. was air tight when the engine stopped, then I could see a bit more point in it but still barely. The air is supposed to go from the air filter (unfiltered on a '65 Dart), into the engine, and out of the PCV valve and to the bottom of the carb with the oil fumes and then burned. It is not supposed to come out anything from the oil filler cap to the air filter during engine operation. If it did, I could see a point in it, but then it would not be the circulation the engine is supposed to have, with fresh air in through the oil filler cap, then being mixed with fumes and then burned.
