360-1 Indy 245 cnc heads

I always gotta wonder about exhaust port flow....people spend hours and hours flowing a port, grinding, CNC'ing, making it perfect. They will fight with their friends for hours over all the theory about how the port should flow and how big it should be and how smooth it should be. Each port is a perfect match to tall the other ports, nothing is left to chance.


Then, they bolt it to a header that is 1/16" inch away. The header is usually a round tube that in no way matches the port and very seldom even mates up to the port with any consistency. Surely the first 4-6" of the header must be still pretty influential on port flow.....