The Stovebolt Site Forums The Shop Area Engine Shop What carburetor is this

I suspect that you might have to bite the bullet and remove the manifold assembly, in which case do all of them.Have a nut splitter handy to avoid snapping the exhaust flange bolts. IIRC there are two core plugs on that side of the engine. If that one is rusted through the others are probably not far behind. They are available in bronze which will forestall a repeat of this to beyond our lifetimes. There is also one on the back of the block that's partly covered by the bell housing and up against the firewall. Fixing that one entails removing the bell housing, which is a lot of dirty work. One might have to pull the engine to get at it; I haven't tried. I dread that day should it come for me.