Gollum - thanks for the feedback. My understanding for the design I am going with starts from the pistons were given to me by Rags. Ok to make sense out of that statement, after reading threads going back almost 7 years - I am going with the P90 head for several reasons. The chamber design is key even though I am not maximizing its use but to me that use is during boost. The other L series heads I have looked at don't give me the CR I want on and off boost and for my HP goals. Granted this is my first engine build but I am going with my "feel by the pants" knowledge, theory and what I know works for this build. Like you said, it isn't a "bad" combo but my goal isn't to get everything out of the engine.
To pick up on the theory end of what you were saying as the air starts to act as a "fluid" and using the quench area to "push" the air out, if you had to guess what do you think the percentage would be for inefficiency or maybe to a guess to what hp is being lost or more likely not gained? Guess I can look at what the volumetric flow diffence would be with the piston 1mm down in the whole vs another 1mm up and a .3mm quench area. Again this would be just theory as different HG would play a differnce there also.
Chuckles, thanks.