All of my custom n20 cams have longer exhaust duration.

This thing also needs moderate RPM to do it's thing. I can't leave off idle or anywhere down low like an automatic; I need RPM to slip the clutch and keep the nitrous kit from sending the carbutetor to heaven. With a 4.10 gear and a 28" tire my usable down track rpm operating window is 4400-6150. At 4400 RPM we are making within 20 ft-lb of peak tq and 500hp and by 5100 RPM we have picked up 100 hp and it carries until redline. Lastly, the engine makes just short of 600 ft lbs at 3900 so I am not really sure why we are calling it a narrow power band. Maybe someone has a dyno sheet from a similar build as an example? I have had a few people indicate the engine is down on power yet no one will tell me why lol.