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My old books of course shows higher pressures for the higher performance engines.
For HP 440's it shoes up to 7 1/2, and hemis shows up to 8 1/2. I'd forgotten that any were that high.
I'd say that if you have an old needle and seat, that anything above about 6 is suspect. Certainly anything above the hemi spec is not good.
Here's the thing about mechanical pumps. The pressure is not generated by the cam lobe, it is generated by the spring in the pump. When the cam actuates the pump lever, nothing happens. The SPRING in the pump does the work, and so this means three things:
It is the spring in the pump that determines pressure
When the line builds up, as at idle, the lever starts to "float" of the cam lobe because of fuel pressure, and thus doesn't do as much work
If you run an electric pump in series, the electric doesn't add much pressure, because all that happens is, that the mechanical pump arm starts to float, and adds nothing unless it's needed.
As I've said before, as old as these cars are, suspect anything. Take a critical look at the floats and needle and seats.
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