Quote:
Originally Posted by 911st
Sorry, the picture helps.
I read somewhere that an ideal secondary tube length is about 18". Looking at the Cox stepped headers and assuming they used the very best modeling to develop them, this may be close.
|
The 18" might be ideal for one motor, but totally wrong for another. The RPM you're looking to make power at and cam timing both have big rolls in ideal primary length, and there are lots of smaller players as well. There is no one correct answer for header length.