I recently purchased a '78 Dodge 3/4 ton pickup with a 360 engine, that needs some brake work. It came with 8-lug heavy duty rotors on the front disc brakes that were deeply scored. When I tried to replace these, I found that the new rotors were rubbing on the sides of the caliper arms (I haven't placed the actual calipers back on yet). Does anyone have any suggestions as to what might be causing this or how to fix it? It's doing this on both sides. Thank you all for your help!