First off from you picture, if you are using that header wrap material, there is a good chance that after a few years of driving those headers will begin to leak! I had it happen to me with a set of Hall headers. That wrap stuff is fine for race cars, but not for a vehicle that is being driven on the street. That wrap keeps too much heat in the tubes and it will burn them out. I can't comment on the fitment issue because I have had Hall headers and now another set of headers which are the Mind Train design and never had a problem with them fitting on stock heads or CHI 2V or 3V aluminum heads.
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