Head Porting basics

1wild&crazyguy said
Xheads will handle it, mildly ported they'll flow 230-245cfm and will go as much as any j head in ported form.

I like the Xhead exhaust floor, it seems higher in comparison, but it could just be the castings I have.:read2:

I thought the x heads were the better/flowing performing head, not the j heads? so it is cfm of the heads that determines how much lift you can run in the cam?