Rebuilt 904, no 3rd gear???

Just in case it got missed somehow (maybe it didn't and I just missed it)

We always flushed the valve body while moving the valves back and forth.
It just too easy for one or two to stick in the bore a bit because of a contamination.

Dang 68, ya shoulda just wrote a diag book there.
Nice info, and by the way. I don't know from experience that your accumulator spring theory is correct but I agree that it makes sense.