Dart 360 identification number

[crdafoe]

Hello, I have a set of Dart 360 heads that have been fully ported, but I don't know by whom. There are some numbers stamped on the ends of each head. If anyone knows what these numbers indicate, i would be grateful to know what they mean. I thought that maybe they would lead me to whatever company did the port job.

Head #1
10312CHM8
There's another number on the back but I can't read it.



Head #2

10313CHM8
986172


Thanks
Chris

[Dart Vader]

Question resolved via phone-call.