Ok, dimensional POV it is stroked not bored, but point is that the whole design is different, new heads, new cam, new intake, new block, etc.
2003 was a mid-model-run update, and the burb got things like digital OnStar, steering wheel audio controls, and a few other perks. I know the crank position sensor design as updated, but basic motor and accessories was the same.
Correct on oil/trans lines leaking, forgot to mention that. I've not had a problem getting parts overall, with some exceptions like straps for the rear fuel tank and one or two other items. Nothing major.
