In its current form its a zvh, it comes with a ferriday decomp plate to lower the compression ratio but the best thing, i think, would be to use a sitech head gasket in its place as i was going to do.

The bottom end can be used with a zetec head, all that would be needed is the blocked water ways re opened up and a gasket and head fitted.

Comp ratio as a zvh will be 7.5:1 ( current state )

Comp ratio as a zetec turbo will be 8.7:1

Thanks

Dave.