This number is on the side on my block?? Can anyone shed some light on wha it is. I cant find anything on it. ## is 125121883

 

Thats sounds like your vin and it's stamped in dot matrix, not cast.
The casting number is on the back of the block on the drivers side right under the head.
People say you can see it on an assembled car, but I never could.
Heres a pic of mine