318 head flow

Seems like every 273/318 head with a decent amount of work peaks around the same number. Steve Dulcich's heads 215, the set I worked on 205, the 310 castings you shared 205. My heads peak earlier do to the larger valve. These ports are a bottle neck, without significant work 210ish would seem to be the typical result. The motor I'm building these for has a 350 hp target so I'm pretty confident it'll get there.