[bfford3]

Ok I have a 351c 4ma crank. This I know. What I have no clue about is what these numbers represent. They are located on the outside edge of the forward counterweight.

 

[oldgator]

Is it internally balanced??? (Metal slugs??)

Could be a Keith Black modified crank...

 

[bfford3]

Not that I saw but I guess I then again I wasn't really looking for any. I was told race teams marked cranks like this but couldn't get an answer on what the numbers represented.