Any changes in Vortec engine between 2003 and 2004?

I'm buying a GMC truck with the Vortec 4800. I've read about the piston slap problems GM had earlier with this engine. Have the problems been fixed? Is there any difference between a 2003 and a 2004 Vortec? There's a
2003 for dealer swap that's got pretty much what I'm looking for and then some. But if need be, I could order a 2004. Thanks
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The 2004 has a little more horsepower & torque over 2003.
2003 - 4800 V8 270 HP / 285 TQ 2004 - 4800 V8 285 HP / 295 TQ
2003 - 5300 V8 285 HP / 325 TQ 2004 - 5300 V8 295 HP / 330 TQ
========Harryface ======== 1991 Pontiac Bonneville LE ~_~_~273,304 miles_~_~_
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