So I received some pics from someone inquiring about a Z-16 Carb I have. And in the pics he points out the the "EH" code is on the passenger side of the Airhorn of the carb for the real Z-16 Carbs.

Now this is the first I've heard of this, do you guys know if this is a definitive way to separate the true Z-16 carbs from the thousands of 3310 "EH" service replacements?

My carb is currently at a carb shop having the throttle plate re-bushed and I will check this against mine. But here are the pics that I received from this gentleman.

http://i138.photobucket.com/albums/q278/Mondo454/Z16Carb.jpg
http://i138.photobucket.com/albums/q278/Mondo454/z16Carb2.jpg

first picture looks like a restamp to me.