Actually,Jon, the Vin tells the Make, Model,(Body series) options, paint code, an sequential build number(It's assembly number on the line)of a vehicle. The Engine number does not specify WHICH engine it is. as in it BEING a Chevy or Buick motor. THAT'S one of the ways GM got around the lawsuits in 77 when GM started it's "Corporate Engnies" bull. My buddy ordered a new 77 Cutlass Vista Cruiser and it came with a Chevy 350 in it, NOT an Olds! Didn't believe it till I saw it once while at lunch. Man was he PO'd! Said if he WANTED a Chevy motor, He's a BOUGHT a Chevy! Can't say I blame him.