I will tell you this, if I had not raised the motor the tubes were jamed tight against the T/bars. Because of the angle they run as they turn down raising the motor helped the problem, it did not take care of it 100% but did help.The Dougs fit like sh-t with TFS heads.I am not new to this car stuff and never had a header fit this bad. I own a number of different brands in my collection and some have headers and the only one would get close to this mess is a big block Fe 428 in my 64 Fairlane, But one look in that engine bay you might excuse a couple dents and those are 13/4" tubes .I am not the first guy here who has raised there motor with the same problem.