318 head flow

skrews said
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.

When I did the 1.88 in them, the runner was the problem overall.
The numbers, i have downstairs, were peaking around 220cfm iirr. It wasn't max effort... but the amount material removed by hand was enough to scare you away from any max effort w/1.88 in a 318 124cc port.
In the end numbers looked like stock 360...only diff was instead of 160cc it was 137cc iirr.