[pkoerbitz]

I'm wondering what you can do as far as gaining power via PCM program.

What can you do for me? how much $$$$???

Oh yeah - motor is stock.

 

[CPWire]

Geez, why do I get called out like this??

Anyway, to be honest, not much. ECM modification and tuning usually has more gain when there are modifications to the engine that would benefit from tuning. A stock Vortec engine isn't going to gain much from reprogramming the ECM, but with headers, roller rockers, a cam swap, and other minor bolt ons, you might notice a 15hp gain from the ECM over the other parts, maybe more, but not much.
I personally couldn't do @#$% for ya, I don't do the programming. Try Fastchip, they do most of our work and they have a lot of experience with the GM FI motors.