ah i never really looked at it much untill i finaly decided to do the swap. Most of the info i have found is other forums is a lot of people asking questions but no answers
the main thing was what headers to use with dohc in a fox wanted to use some long tubes.. BUT i found a stuper super killer deal on a 3v but idk how many people have done that in a fox yet and if any long tubes will work might have to get a custom header made.
any off the shelf headers will work for a 4v swap. 3v swaps I have no clue as I've never done one personally however I don't see why an off the shelf 3v set wouldn't work as well.