Graham,
The only difference is that the DXH6a has horizontal outlets in the cap for the spark plug leads , compared to vertical in the DX6a .
Both are very basic distributors . My experience over 50 plus years that even a new Lucas distributor is only good to about 3500- 4000 rpm , much over that they become erratic , probably due to points bounce .
I would not consider the original ignition advance curve ,as today's fuels, higher compressions of most Bristol engines today, often different valve timing etc etc , the large total advance of the 50's is not needed today.
I do not and will not run a Lucas distributor in either of my Bristols , especially if it was a D2 engine
What D2 engine are you working on ??
I have new horizontal outlet distributor caps if you need one .
Geoff
Sydney/Australia
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