Rhs Indy X Head Thread

I've done a lot of research on header primary tube size and length as well as collector size and length and what I found was most header builders agree that on a real race engine the primary tube diameter and length aren't nearly as important as collector length. Most race cars are pretty much set as to how long a primary tube you can fit in it and once that is set tuning can be done with collector length. This seemed to be proven true by several magazine articles I've read, one in particular that was an old (7 or 8 years ago) Car Craft article where they tested different tube diameters and lengths and as long as the tube wasn't too small the actual length and diameter had little effect on the power output but the collector length did. This of course did not take into account the shorty style headers which aren't considered a race header anyway.