force headers competition headers truck force headers footnotes 1 this system ... these models 41 this header requires 1958 and later blocks with side motor mounts ... with provisions for oxygen sensor all parts are coated with hooker s metallic ... y-block engines 96 the header requires 1958 or later engine blocks and hooker frame ... installation requires use of gm factory parts frame stand left #1705321 right # ... left #1250717 right #1250716 above parts also available from 75-78 skyhawk ...