October 8, 2016I CAN"T GET ALL THE BOLTS TOO THREAD ON THE PASSENGER SIDE W.T.F? FORD F-150 5.0 1991
November 5, 2016This is pretty normal for a header on a 5.0.
Do these headers have 4 individual flanges? If so, you can pry the tubes side to side to line up the bolts.
If you have 1 flange that forces the ends of the tubes to be aligned, and the bolts still don`t line up, then you`re going to need to adjust the holes (drill them out a little bigger or somehow slot them).
Better headers have one flange, and it lines up. This is really key when you take them off for any reason and want to put them on. The 4 flange type warp from the heat, so putting your headers back on (or putting used ones on) is a royal pain in the ***.
MrSVTGal (has headers on a 5.0 Mustang)