I just got a used 85 190e 2.3, but it was imported from Germany by the original owner and the VIN doesn't cross at Mercedes to anything (actually they think it's a 2001)

Is there an easy way to tell which engine it is? It's got an automatic, which I understand should mean 8 valves, but I want to be sure, and I don't want to take off the valve cover.

Thanks.