YO reproduction BB manifolds have in the past been
excellent in fit and appearance. We have personally used them and have countless customers using them with our exhaust systems with no fitment issues. There could be a few factors causing the problem. If the flanges are spread to aproximately 21-1/2" apart on the h-pipe and the h-pipe bolts to the manifolds but hits the left torsion bar-check the engine alignment. Measurements are 2.50" offset to the right and 5-1/2" in elevation from the top of the k frame with all measurements taken from the center of the crankshaft. If this is within specs then try a different brand of h-pipe. I disagree with Dayclona in the above post regarding his apparent problem with one of our h-pipes. He also made this same claim in an earlier post last year. Dayclona has his wires crossed. There is no proof that the h-pipe was from us and we have no record he has ever been a customer. If we manufactured our product as poorly as he has claimed we would not be in business today.