I’ve got a 47 Chevy panel. Just did a valve job and cannot get the exhaust manifold to line up with the exhaust flange. Therefore there’s a big leak there. I’m going to have to take it to a muffler shop to get this fixed but in the meantime I need to move it. It starts but will only run at full choke. Take choke even halfway off and dies immediately. My question is does this lack of back pressure cause it to only run at full choke? Thanks for any help! David


1949 Chev 3800