I noticed it on my 68 Dart. I put a 73 set-up on the front with 15" x 3 1/2" Weld ProStars that were centered on the wheel spacing. My tires rubbed my fenderwell headers. I bought a set of 15" x either 5" or 6" ProStars with a deeper back space and have better clearance. They still rub, but not near as much. I can turn my steering wheel stop to stop now. Before I couldn't.