Does or has anyone tried installing 68-72 455 headers on 67 delta 88 2 door?
It has factory 425 C code head engine. Also does anyone know how to tell without taking heads off if it's big or small valve C heads?

Thanks..Paul

 

The original 425 in your Delta would have C heads but small valve C's....only the Toro and 442 had the big valves.....The passenger side header will most likely work but the driver's side will not due to location of steering box on the frame. You would need to re-work this side and how much I do not know. The correct cast manifold is being reproduced if ya want factory style dual exhaust on the car.