'97 A4 Engine and Wheels

[Doug Johnson]

I've been away for a while, so please excuse any ignorance I may exhibit.

I've run across a '97 A4q 2.8 with a manual transmission and the 5-spoke OEM 
wheels.
Looking at Bentley manuals online, it looks like they went to the 30-valve 
V6 mid-way though '97.

Are there any physical distinctions that will tell me if the engine's a 
12-valve or a 30-valve?
I'm going to have to bid on the car without seeing it, because I'm headed 
the other direction next week.

TIA,

Doug