If you want high horsepower, naturally aspirated, lower displacement you mean you like DOHC engines. If that's your thing, GM doesn't do that on a V8, but DOHC isn't all roses as they weigh more and takes up more space per liter of displacement.
IF what you care about are just two numbers HP/displacement and being naturally aspirated Honda's F22C1 does have nice numbers but as a total package it's fairly mediocre by modern standards. The power curve is weak, and it's less fuel efficient at 18/25 vs 19/28 for similiarly weighted cars (S2000 vs Solstice GXP, so slight weight and extra gear advantage for the Honda actually), it just doesn't keep up with GM's 2.0T or several other modern 4's.
Last edited by Tal; 02-04-2009 at 06:05 PM.