It is indeed a "closed crankcase vent system" option code 387, MSRP $5.20. It even appears on the microfilm. Both my G coupes were California cars and have it. It was available on any 1961 Chrysler and I've seen at least one non-California 300G with it. Incidentally, I've found the nipple on the balance tube used in the system is a great place to plug in a vacuum gauge for tuning your carbs. Another advantage to having it. Andy __________________________________ Do you Yahoo!? Yahoo! Calendar - Free online calendar with sync to Outlook(TM). http://calendar.yahoo.com