Nitrous on a stock LS1...
1.Upgraded fuel system
2.TR6 plugs or colder
3.ditch the HPP3 and run about 20-22 deg timing(what i run) tune A/F with a wideband O2 (i run 10.5-1)
4.Good gas for safty
5.if you do dry you'll need bigger injectors also
P.S. you be running on borrowed time, stock internals won't take that much nitrous forever. It may pop on you first bottle or your 100th bottle.

