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White = water/antifreeze
Blue = oil
black = rich

If it's a '96 vortec (assuming by your username) it most likely is intake manifold gasket judging by your description of white smoke(coolant, it is actually steam you are seeing). Theses engines are notorious for it going out.

They best way to diagnose if water is getting into a cylinder is to do a compression test and a leak down test. You can also pressure test the cooling system to check for leaks. Like I said, these motors are notorious for this.
 
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