X is worth more to the restore guy.... To the performance guy, it's a guarantee that they get the 2.02. As far as flow, we could flow two X heads and they would flow differently. Casting on cast heads is far from consistent and perfect.
After doing a smooth of the x head bowl it did 226 cfm
Now I have a set of 2.02 j heads, stock ...3 angle with the steep bowl cut , no smoothing...and one port does 228cfm
It's the in between numbers that are different between them and yes the rest of the ports could be less ,like 218cfm OR near the same in flow.
