Facebook has definatley slowed down the traffic on forums.
It is instant and it comes to you.
Forums are still superrior for looking up real information, facebook is all replys from random users (good and bad). I feel forums still have the people who are truly into it, joining a forum takes more commitment than clicking on a Join page button.
Personal opinion... As time goes on there will be less information on facebook from those who did and more from those who have heard.
Cant beat a good wiki page like on here. (info from those who know).
Also, Your price for the head is good. I just paid that for double valve springs and the seats to suit.