interesting thread...
for what its worth... I dont categorize internal engine work (cams compression and porting) with nitrous . i understand the bang for the buck argument but in my mind building an engine is about matching the proper cam to the right heads and compression to achieve the most power one can from the given architecture...
I nice build up may also involve displacement increases but again, you dont fully realize the benefit of those extra cubes until you match the cam specs and the head flow appropriately.
I sometimes think of nitros a bit like steroids.... its cheating. You get away with it because its cheap and it works but its not the same things as a solid program for building a lasting strong motor.
No disrespect to those nitros lovers out there....it definitely works....but where is the fun and challenge in it... with vmax motors in junk yards etc, you can get one on your work bench pretty quick and just tinker with it as you save uo your pennies and build a real nice little mill. Sean seems to have quite a few ideas on what works and what doesnt.... its a good resource for a fun project.