Getting close to finishing stages of re-build / start-up of my 401 with Quadrajet. I'm reading that there is available a thin or thick carb base gasket. Not sure what to use ---- advice please.
You'll need both. If the application what I think it is, the thicker gasket goes on the manifold first. The steel shield sits between the thick gasket and carburetor. This may help: https://quadrajetparts.com/quadrajet-base-gasket-thick-buick-1966-p-98.html Devon
You are correct, the only job for the shim/shield is to protect the carb base from corrosive exhaust gasses. The regular "thick" gasket will seal everything just fine in your case. Devon
Glad to help. Hello from "up north" (Michigan USA) where for now, everything's changing colors from white to green! Devon