yes it does look like the large valves help flow. contrary to what most volvo engine builders say o this side of the pond. were most i have talked to in sweden have said to always put biger valves in unless rules in a racing class prohibit it.

as far as lift goes i think most cams don't have lift above .47 , well atleast for the ohc, and some big ohv cams go to .51

i just wanted to get a base line before i started working on them. in the end i hope to have all the ports flow the same. i've been contacting some cnc porters to replicate my best ports across a head but none of them want to work with steel heads. it would be easy for me to get a ohc head to flow exactly the same on every port, but it looks like it will take some work on the ohv.