Originally Posted by 78buckshot
The 2 brass screws with springs that are threaded into the aluminum body of the carburetor are idle mixture screws,
the screw behind the choke should be a fast idle adjustment, and the screw near the throttle cable is curb idle adjustment.
The PCV hose that is connected to the air cleaner housing should not have a PCV valve on the other end, that hose admits fresh air into the engine crankcase
, the PCV valve and hose suck the combustion blowby gases out of the crankcase and re-burn them. If it's running well enough for your use then "if it ain't broke, don't fix it"
It runs great but I’d like to have it functioning best as possible.


So what is used to connect the hose from breather to the valve cover if not a pvc?
Do I have the rear PCV valve hose connected to the carburetor base correctly?
I checked the niple that the timing advance hose connects to with a vacuum tester. It reads 15 lbs at fast idle, slow idle not anything.
Thanks for the help!

Last edited by glennj3; 02/24/2024 12:34 AM.

1953 Chevy 153A 3/4-ton
Working on my project since 2015
Follow along in my DITY