That's a long lived debate right there. If you made a list of mods to do to the 6 cylinder and get the best bang for the buck, a camshaft change would likely be first, followed by increasing the valve size. The dyno tests we did a few years back showed the lumps to not really produce the increase in power for the effort and money spent versus the same head with just the bolt bosses removed, and really, at the end of the day the return in investment(HP) is what it's all about for most people. So for your forced induction app, many will say yes do it, but after seeing first hand what they give in return, I would say probably not. Remember, many racers won many records without lumps even when their competitors used them. The choice in the end is still yours. Not trying to be pro or con, just stating the results as shown from dyno testing many combinations.
As for the valve centerline info, what are you needing to know specifically....?
