Has anyone ever encountered warped header studs? I'm trying to get these header flanges installed for akra headers and the flanges will not go on easily, its like the studs are warped. I got one flange on but it took over an hour or finessing it. I tested the flanges on my old head that i have laying around and the flanges slid on there perfectly almost with no effort. Is it possible the replacement head I installed has warped header studs, any ideas?