Carb Tags?

[---Pimp-My-Rolla---]

Bit of a noob question here but what are the dog tags on the aisan carbs for?

 

Can they be used to find out what k motor they are from?

 

I understand that the less carbon emmission stuff means the older the carb.

Edited August 10, 2012 by ---Pimp-My-Rolla---