I called Branch Flowmetrics and inquired about our 103 heads. As has been mentioned, they don't really do these at Branch. However, I was told that if I wanted to buy the Zipper's 575 cam-for example- I could send them my heads, and they would smooth out the ports and set the compression for about $400. I was told that they would put in their bronze valve guides at this time also. Right now this is the way I'm leaning. Has anybody else either done this, or talked further to the people at Branch? This seems like a reasonable way to go. (They told me at Branch that the bathtub shape would raise the compression too much.) -Steve