Hey everyone, I'm looking for a little help on a part identification. I have attached a picture of my vacuum tree that attaches to the back of my carb on a 1964 2bbl. On the right side in the picture is the PCV valve and it's tubing. On the tree in the plug below the PCV valve, I would like to know what the little square shaped device is. uzzled: It looks like a pressure relief valve. My next question would be was this factory or some "performance enhancement" put on my car in the 70-80's? Thanks! Joe
