I have a 70 cutlass supreme convertible with a 455. Why don't they list headers for Cutlass Supreme? I pulled the motor to rebuild it this winter and really want to swap the stock manifolds for headers.
Any help would be great!

 

Any header that will fit a 455 in a 442 or Cutlass/S will fit a 455 in a Supreme. Frame, engine location, common obstacles, etc. are identical. Some misinformation about an engine location "offset" in Supremes got started among header manufacturers years ago and just won't die.
Terry

 

Thank you for for info, it never made sense why the supreme would be any different.