Another Strange Air Cleaner on 66

[Metalaroundstone]

Originally Posted by ray_mcavoy

Actually, your 66 327 would have originally had a Rochester 4G carb with a cable operated hand choke. The carb on there now appears to be a 4GC which is basically the same carb with an added automatic choke.

That plugged off "vacuum line" connected to the carb's air horn is a fresh air source for the automatic choke.

My carburetor has no ID on it except " Rochester" and "4 Jet." It is helpful to know it is a 4GC. I do not see any place to attach the hose on automatic choke mechanism. The only choke outlet attaches to a copper tube that goes to the exhaust manafold.

By the way, I was told by the guys at 4-5-6 Chevy Trucks that the 1966 c10 with 327 did not come with a 4 barrel carb, but the 1966 service manual addendum seems to disagree. I know, however, that my truck came with a 2 barrel, which was replaced with a 4 barrel by the PO. I have been told that the 4 barrel gets better mileage than the 2 barrel, but I can't confirm this.