Originally Posted by
hsukaria
Looks like you are missing the threaded tube that the HSN screws into. Is there a jet tube visible inside the venture?
The discharge nozzle is pressed into the barrel. The threaded portion the needle valve screws into is machined into the outer needle valve housing. See my pictures. It appears Cougars carburetor was possibly crashed (and thus broke the threaded part off) and the previous owner drilled and tapped the outer housing to plug it to use a RNV. Here's my .330" EZ carb's needle valve housing and related parts: