G6er says:

If you leave your engine with stock internals. you can run 5 to 10 lbs. But it will harm your engine. It might not harm in right away, but i promise you the lifespan will be much less with a turbo on it. It’s more heat, more stress, more pressure. More wear and tear. Also, if your going to do a turbo, you should really consider what other work is required to have a turbo work correctly. It’s not just a bolt on part. There are tons of things you should have done to the engine. You need more fuel, so you need a better fuel pump, fuel rail, ignition system, wires, plugs, all that. you need it to breath better so you need free flow exhaust, and an intake, you need the intercooler to keep the temps down. You need better oil to keep the turbo lubricated. You need a tuned ECU so that it knows it’s got boost and how to make power with it. You should have a different cam, better cylinder head, better valvesprings, seals, Don’t think your headgasket wont be under more stress. And no, these are not cheap parts. Mind you, with all that done, you could run 20+ lbs of boost. with nothing done, your going to hurt your engine, and not even get all the performance out of your turbo. Just some food for thought.