considering that alot of parts are interchangable for the b series motors, i guarentee that you can get parts for other b series motors and have them fit onto the b20. id rather start with a b20 motor, simply cuz i like tq....seems as though some people forget about the real number, considering hp is a calculated number based on tq and rpm.
Honda:
jdm h22 produces 220hp, thus making 110 hp per litre
jdm b18c type r makes 197 thus making 109.4 per litre
usdm b18c5 makes 195, thus making 108.33 per litre
s2000 motor makes 240hp, thus making 109 per litre.
Toyota:
usdm 3sgte makes 200 hp, thus making 100 per litre
jdm 3sgte makes 225, thus making 112.5 per litre
Dodge:
srt-4 makes close to 240, making 100 per litre
Volkswagon:
gti 1.8t makes 180, thus making 100 per litre
--hey didnt say nothing bout turbo now did you. go ahead say that its a best of a motor na....seems that the ones from the other ones from honda are pretty good too now huh?--
but hey, dont matter if your motor makes more hp per litre, its not all about that at all. the gsr is faster than the si motor.....and wow it dont make as much hp per liter....your reason why its good is dumb.