dunque,per l'81 vale quanto segue...

1st 1 = Nation Origin = US
2nd G = Manufacturer = GM
3rd 1 = Make/Type = Chevy/Passenger
4th Vehicle Restraint System: A = Manual Belts, B = Automatic Belts, C = Air Bags
5th Y = Carline = Corvette
6th/7th 87 = Body Type = Corvette
8th 6 = Engine Type = L81
9th Check digit to verify VIN#
10th B = Model Year = 1981
11th Assembly Plant: S = St. Louis, MO, 5 = Bowling Green, KY
Last 6 digits Production Number starting with 400001 and up.

ti e' piu' chiaro????