1-5/8" x 1-3/4" Small Block Step Headers (273-318)

Fits: 1963-66 A-body, Polished Ceramic Coated w/Thermal Barrier

Note: 273-318 Cylinder Heads with the port size of 1.550 x 1.090, will require modification to the ports for the headers to seal properly. Additional material will be added to the ports for headers to seal properly. Modification will be done prior to coating, please allow additional time for the modification and the coating process, approximately 4-6 weeks. Headers requiring modification is considered a "SPECIAL ORDER".