Found the fourth bolt!
Well I had been looking at a schematic for the earlier single chain head, so I didn't realize the bolts are placed a bit different on my later dual chain head! The fourth bolt was outside the valve cover and buried amongst the sensor connectors, and was a standard 13 mm hex, not an allen head. Took it out and one mild whack and off the head came!!
Now I just have to re-assemble it....8^)
-Steve
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