Power per inch doesn't scale, small engines always have an advantage. This was known 100 years ago.
Just build a bigger motor and ignore power per inch.
A friend of mine has just bought a motor for his s/strip Roadrunner to step things up for next years racing and cruising, unusual spec for such a big motor>
589ci street wedge, 572-13's, 10:1, small solid roller .620", made 705hp/750ft lbs on the dyno with a single 850DP, his car will drive like a Cadillac and run mid>low 10's in the 1/4. Plenty of potential with head porting, a cam/carb upgrade when he gets fed up with the 10's.... has enough head to do it.
