I voted YES! Sooner the better.
There is A LOT more in COMMON with these (2) engine series than there are differences.
It would be MUCH more beneficial to the Members to use (1) forum that rather hoping, skipping and jumping around all over the forums to find an answer to an issue.
BTW, I'm a very seasoned veteran of car/truck forums and have owned/administered/moderated several myself.
Some car/truck website's get absolutely crazy with the huge number of forums in use. It get's to be a real PITA for Members to find stuff.
After all, these forums exist for the MEMBERS. They need to be user friendly FOR the Members and not just easy for the Moderators to control.