Is there a way to tell by looking at a fuel injector whether it's stock 24#, 30# etc...? Someone is offering me a replacement set cheap and they said they are stock as well, however they appear a little different. Do stock 24's have some kind of tell tale signature or a part number stamped on them?

 

If they are an OE piece you can go by the part number. Your local napa or chevy dealer could verrify the part number for you.

 

The part number is stamped on it?