557 ford stroker block
 

We are building a 557 cu inch stroker motor utilizing a factory ford 460 block. We are boring the block .080 over and are needing to find the factory block designations which indicate a thicker cylinder wall from the factory. We have been told they are possibly identified by a A, B, designation with possibly additional letters and numbers. Does any one have any further info related to this that could aid us in selecting the correct block