JCL 378 Etched on '07 head?

I bought a used '07 R head that has the letters/numbers JCL 378 etched on the side of the head.  Anyone know what this is/means?

I bought a used '07 R head that has the letters/numbers JCL 378 etched on the side of the head.  Anyone know what this is/means?

could have been a head for a racer?  with his intials and number?   thats about all i can think of.  

 

edit- does it look ported?  they might have put the name and number to keep track of whos head it was

Edited by 563ripper

That's kind of what I was thinking.  It looks stock (no porting or grinding in the ports), but might be a head prepped by someone for a rider.

a lot of places do this so they don't mix up heads. probably the initials of the guy who owned it before

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