After taking a good look through
Another Chevron one and also
Chevron B48, I can't see any way of making a coherent story out of any split of those threads. The "Another Chevron one" thread is unable to focus on any one subject for more than about two posts and a large proportion of the posts address several subjects or address a car where we simply don't know whether it was a B42 or a B48 or a B49 (or a B46 or a B47). However, the basic gist of it is B42s, B48s and B49s. The Chevron B48 thread does at least stick on its subject.
I hate to say this, but the best idea I can come up with is to:
1) merge the Chevron B48 thread into "Another Chevron one"
2) rename it "Chevron B42, B48, B49 and other late Chevrons"
3) lock it!
4) Encourage someone to start new threads on the B42, B48 and B49 along the same lines as Chris's new B20, B25 and B27 threads, starting with a summary of what we know.
Or are 3) and 4) a bad idea?
Allen