hemi advantage?

I have to disagree RRR in where the newer "wannabe" Hemi heads are inferior... From a pure efficiency standpoint the newer chambers don't lose anything by having those two squish pads there is still a lot of space around the valves. The included valve angle is much shallower on the newer heads because 1) it allows good compression with flat-top pistons due to smaller chamber and 2) you don't give up much to that massive 53* angle anyway. If you read about the A-279 "Ball-stud Hemi" Chrysler engineers knew this but when they designed the 2nd-gen 426 heads they were crunched for time (as we all know) and simply adapted the old 392 heads, enlarged the valves, and tilted them towards the intake side.

IMO the purist Hemi argument is dumb you can't argue with decades' worth of R&D... maybe it's just cause I'm an engineer but I would never say the older Hemis are better just because they are closer to a "true" Hemi design in fact I think they are worse as a true Hemi head isn't all that efficient anyway. Like moper said the 4-valve pentroof design is "where it's at" and is why you see it on most modern engines...