I have a question about header tube diameter. Is it true that the 1 1/2" primary tube size is better for the scavenging of the cylinders as the smaller tube size will remove the exhaust gases faster and more complete? From the reading I've done this is supposed to be true in engines up to 360 cid and less 500 horsepower. I don't know this as fact only from what I've read and you know how articles can be miss leading. So I thought that I would ask someone who has the experience and knowledge about these things.
