Richard,

I am not sure if that timing light arrangement would work. Not all Roosa-Masters have a vane pump, which is why the 6.2's had a mechanical pump driven off the camshaft.

Brian,

I would stil be interested to see if a timing change took place based on low lift pump volume/pressure. This is the point that I have seen in this thread and it is what I asked John and Gus specifically and their answer was emphatically that low inlet pressure will not change the delivery tiiming, providing the system is not aerated...Robert