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... did you end up getting your pump modified by Rocklea Diesel?
I found out some of what they do (allegedly) to it so you can do it yourself.
There are essentially two changes:
1) to the springs and plunger in the horizontal advance/retard barrel (on the engine side of the pump)
2) to the linkages inside the housing on the other side of the pump
I don't know exactly what they do to (2) besides that they change the linkage positions to alternate ones, however to (1) they cut down the piston and replace the springs with weaker ones.
Apparently, just replacing the springs with slightly weaker ones will have a big difference on performance. It is extremely easy to do and there is no harm in experimenting until you get something you are happy with.
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[...] on the pump, on the side facing the engine there is a steel cylinder about half way up, mounted horizontally, with a nut at each end. This bit advances or retards the pump timing as the engine revs change, so changes to this bit shouldn't make the engine smoke, or affect fuel use much, but can have a reasonable effect on performance. If you remove the nut closest to the front of the engine, you will find two coil springs inside. Swapping one or both for softer springs or even removing the inner one can increase performance. Although if you make them too soft the engine will ping a bit under hard acceleration, because the pump will advance too quickly.
The rest of this thread was about internal injector pump seals and o-rings which I deleted.