Originally Posted by
sweet-94z28
I've ran a 150 before on 93 octane with 34 degrees of timing without an issue. Problems arise on more nitrous than that with pump gas. You build an exponentially larger cylinder pressure spike as you increase the shot size. A 200 shot is a gamble for sure. With pressure comes heat, and forged pistons handle that a lot better than Hypereutectic ones (even though the stock Mahle pistons are badass for stockers).
My best guess would be to pull 4-6 degrees of timing to avoid the pressure spike and pray that the better fuel will keep the pistons cool enough to avoid meltdown. And dawdaw is right, too much fuel, and you'll lift a ring land. I think c16 and a fuel cell for it are great ideas!
Theres an an article somewhere on LS1Tech where a guy has something like a 250 shot on a stock ls1 and he's been doing it for quite a while. It's a good read to learn about nitrous and how to run big shots with little damage.