Topic: Numbers on heads

[1969CJ]

 Need some help deciphering numbers found on my heads on a 428CJ. Pictures of each head are below. Thanks.

[J_Speegle]

Possibly a job number applied during a rebuild of the heads or engine at some point.

You don't say where the car where the engine came from was built but there were some workers at at least one plant that sometimes used the head rather than the block to locate the VIN. Problem with that is there are too many digits and body code of 53 would be a Ford Custom 500 4 door sedan. Guess that is a long shot since you don't report what kind of heads (engine size) or casting numbers they have

Guessing at best since you didn't provide much information to go on

[krelboyne]

Looks like a Social Security number. Some machine shops stamp customer parts at the beginning of a job.