I had the choke linkage on my stromberg carb for a poly 318 bind, it would only do it when it was warmed up cause the dash pot was pulling the choke to stay open, wouldnt bind when it was cold cause the choke was closed, was nice when you wanted to go around 35-40 but not at a stop light, usually if i taped the throttle it would free itself, drove me nuts till i figured it out.