[K Stubbs]

I know a racer that ran a 69 Camaro 350/255 auto stocker. He had a set of Kromer (sp?) step headers that were 1/12 - 1/58 - 13/4. He blew out a tube at a race and put on a straight 13/4 on that side and did not affect performance one bit. He ran it like this for a couple of years and won class many times including Indy. Like Wade said, unless you are way out in left field there is probably not a big performance difference in them.