The headers you see in the pictures are proto-types and have yet to be tested on the dyno. Some changes may still be made. 1 change will be another set with 1-5/8" primaries. The #8 tube will be lowered
if possible to make more room for a brake booster.
As to every possible application they might or might not fit only time will tell. We don't have a yard with every model Ford ever made with a Y-Block to test fit. Futhermore, add in the modifications that have been made with various brake boosters ect. and there is really no way of knowing.
A 55 model was chosen because the engine compartment is tighter than the 57 and later models. Theroetically, if they fit a 55 they should fit later models, but until it is actually tried there is no way to know.
http://ford-y-block.com 20 miles east of San Diego, 20 miles north of Mexico
