383,speedmotive kit, 11:1cr,57 rods,eld. performer rpm alum. heads, comp 520lift, 305dur, victor jr. intake, holley 750 carb. how much nitrous can I safely run without "boom" lol

You left out one of the most important things. The actual specs of that kit. Is it fully forged or cast with hypers...? Id do some checking, but just for a warning, I have heard a lot of bad things about the speedomotive stuff. Mostly the talk was about their motors being way overrated and not nearly performing up to their supposed power potential once you get it home. But even so, if thats all true(which I dont personally know either way), than it would not be too much of a stretch to say that there is a possibility that the components themselves may not be the best quality either. Id look into it. Anyways, back to the original questions. With the aluminum cylinder heads and the relatively large camshaft, Id say you can safely do a 150 shot. But, a lot of other things, including of the shortblock will dictate how far you can actually go, and if you can go to 150 in the first place. What kind of plans do you have for the entire fuel system, nitrous system? Just a better fuel pump and a basic nitrous kit, or are you gonna go with a dedicated fuel system along with all the safety goodies for nitrous? What fuel do you plan on running when you run on the nitrous. Will it be pump fuel only, or is there an option for higher octane fuel if necessary. Is that a hydraulic or solid camshaft of sorts? Im assuming hydrualic but obviously am not sure. Could you provide more of that camshafts specs?

Ring end gaps? Without knowing that, I'd say stay away from the bottle.

Just about anything will take a 100-125 shot safely, after that you need all the specs the others are asking for.

http://pages.prodigy.net/indianahawkeye/newpage37/9.gif Lay it to her... you will know when its to much :D

TROY

The cam is hydraulic, and the pistons are Hyper-Eutectic.Does that help?

I'd probably limit it to 100hp shot...those pistons will not take much. Forged is the way to go with nitrous.

I'm with Rapid Robert. Limit nitrous unless its built specifically for nitrous. You need to learn all you can about its application/installation and use or can granade engine in a hurry and possibly cause serious injury! ;)

I'm trying to do my homework first. Oh yeah It'll be running race fuel 112oct. and it will be a top of the line system with the supporting fuel system.

iam running a 150 shot on cast pistons...
you should be fine aslong as you safe and it sounds like you will be..

Hypereutectics don't like detonation. Rattle them hard on the bottle and they're toast.

cast pistons can take more than Hyper pistons, hyper pistons are tough but brittle.