"modern" combustion chamber "design"

hmmmm

turbos are modern. oh wait they were designed in 1905. over 100 years ago lol.

get off the modern thing and think instead.

the shape of a combustion chamber is only going to change things minutely. what really matters is flow, velocity, compression ratio, etc. quench/squish/all that crap comes into play if you are not using race gas. if it's a street engine then you are limited by fuel.

if you have lots of E85 available local to you then you can go 12.5:1 compression.

that being said, the heads with raised ports will outperform the stock sized port heads every time.

so W9's and Victors and some others with raised ports will eat up the other ones, especially at higher rpms. combustion chamber design has little to do with this. but if you are on the street you are not going to be runnin around at 7200 rpms and stuff.