Should horsepower per cubic inch ever be considered when looking at heads? I may have worded that right the first time idk lol. Just bench racing in my head.
You would with Cubic inch and rpm (displacement over time) which is basically potential Hp, the engines we deal with have a somewhat narrow range of efficiency.
Eg.. If at 100% VE 318 @ 7500 rpm and a 511 @ 4667 rpm would displace the same amount of air a minute 690 cfm. To me the true displacement of you engine.