I don't know about the mac's. I have the BBK unequal shorties and the first set I got was tweaked and never sealed right. I sent them back to Summit and the new set fit fine. If I was going to guess I would say that the header is bent and won't seal right no matter what you do. Send them back for a new pair if you can. If I was going to do it over again I would go with the FRPP headers, as they come with the single piece flange, the BBK's only have the single piece flange on the chrome, not the jet-hot ceramic coated. I have also become disapointed with BBK quality and am considering anyone else before considering them for any part. Just my .02.
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91 LX 5.0
Z t-5, Centerforce DF clutch, Pro 5.0 shifter, 3:73's, Vortech 73mm Mass Air, Accufab 65mm TB, BBK underdrives, BBK unequal length headers, Bassani x pipe, 2.5" Dynomax Super Turbo cat back, Kenny Brown Super Subs, Factory Five Control Arms, Crane HI-6S Ignition, and more to come!
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