1999 5.7 Vortec problem

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Seppl

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Hi guys.
Got following problem with my 5.7 vortec.
Started fine, drove out of driveway and she started back firing and smoking really bad, no power.
The fuel tank was a quarter full, by the time I limped it back into yard, fuel tank was empty.
Oil dipstick is 4 to 5 inches overfull now.
So I'm guessing the fuel went into the cranking case.
I'm guessing Piston rings are gone, or is there someway else the fuel can get into the oil ?
 

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