John Y. started following 1968 Pontiac 400 Engine Block VIN number stamp sizes
I have two 1968 Pontiac 400 blocks and was checking the VIN numbers on both. One has a very tiny VIN number ( I measured 1/8" tall with calipers) and the other is about .2" tall. I did not check at what plant the blocks were stamped. Did Pontiac use VIN stamps of different sizes?