When I go to the junkyard, how can I tell a dohc neon from an soch?

...look under the hood? =D

haha. I know there is a difference in how it looks, but unfortunatly I am new enough at this that I don't really know how to tell. I am trying to learn all I can by web sites, but have not had that much luck. I know, damn newbies.

The hood on the car w/dohc has a "bubble" to one side

97 expresso had SOHC with bubble on hood

I found a dohc in a 99 sport. No bubble there though.

An SOHC has a single cam gear, and the DOHC has two. The timing belt cover on the DOHC is wider at the top because it houses two cam gears.