School me on W2 heads.

Ok I'll subscribe to this one, 310 views and 8 replies so there's plenty more as well that want to know.

We never got the WSeries heads here in Oz so until eddies can along all we had were J's

So we/I get lost with the difference between W2,W5 & W9 heads, what parts are required, early and late heads, 59* & 48* and what interchange's.

Rob(Rumblefish360) I know you've played with these heads and a lot of other member on FABO, someone can help out