From the pics they definately have some work done on them, But not much IMO.

The biggest negative factor that I see is that the Short turn doesnt appear to be touched at all. If it hasnt and it doesnt appear to be that will limit the heads flow to a max of 250 CFM IMO

Dwayne from PHR schooled me on that. The Short turn is the key to getting the stock heads to flow over 240/250CFM. mike