Odd VIN

Hey guys,

I had a quick question. Everytime I go to a mechanic or just even bs'ing around with fellow car guys, I always get a "wtf" about my vin #. yeah, I know its a VIN number, but it has an X in it. I'm sure it don't mean squat, but does anyone know why they changed it over for the V or whatever it was on most of the 97's? I know one difference is the water pump pulley, but thats it. Just something I've been thinking about...lol