RobotMan 264 Report post Posted November 2, 2014 I have a set of original (I think) manifolds for my 69 Mach. There is a port on the passenger side manifold near where the remaining exhaust components would connect. What is this port for? It appears to pass al the way thru with something threaded in it. Any help would be appreciated. Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted November 2, 2014 If your referring to a small, about 1/4 inch diameter port, a metal tube or sometimes hose would connect to it and go to the hot-air automatic choke on the carburetor. Air would simply pass through the tube and be heated by the exhaust manifold. The hot air would heat the bimetal spring in the choke causing the choke to open. The fitting doesn't pass through to the interior of the exhaust manifold and is usually just left open when any other type of choke, i.e. electric, manual, is installed. Quote Share this post Link to post Share on other sites
RobotMan 264 Report post Posted November 2, 2014 Thanks for the info. Makes sense now. This will not be functional for me. Quote Share this post Link to post Share on other sites
