Header/head question

[corylee316]

Ok, for my 100th post I have a question about the head and header. There are anti-reversion dams built into the head. I read that you should not remove them when doing head work b/c they help keep the exaust pulses from messing with the next fire out of the combustion chamber. In another thread ( I belive it was Group A's rebuild) the header that he was building was a bigger diameter so that it would basically do the same thing as the dams. Could the dams be taken out in a head job ie. port polish, and a header built with the tubes being a slightly larger diameter than the flange create the same effect? In essence flow marganally better when designed right. Any help with this would be helpfull. I'm getting ready to put the car down for the winter and this is on my list of matinence/upgrade items.:1zhelp:

 

[corylee316]

Should I ask this somewhere else?

 

[corylee316]

I pretty much got an answer on this. The dam is there to help pull out the next exaust pulse for the stock manifold. I guess the question now would be that if I go to a header that has the step if that is nessisary, or if the tube header will do a good enough job "pulling" the exaust out. I might have to do it and dyno before and after. The thing that worries me is if I do it and it dosen't work that I now have to find another head.