340 Max HP Potential with X/J heads?

Work the Straight wall, guide, guide kink, roof and bowl. Do a good throat cut and blend it to the bowl near the roof.
















You can blend the throat cut at the short turn at/near the peak/top, but unless you know what you are doing... leave it at that. With flow increase and not enough cross section...in comes the air speed.. and with too much the port goes turbulent and flows less!