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Which fuel button is in the injection pump varies. Those who have opened their pump have found anywhere from a 18 up to a 31. Same thing with the pressure, it's all over the place. The NHC250 in my wrecker is an example of one that was turned up. Happily cruises at 2000rpm/55 mph on my 395's...

Going off the video it sounds like it's running fine. Older diesel engines (non common rail fuel injection) are noisy and make alot of clatter. The smoke out of the exhaust when you step on the throttle is a little bit dirty but as you mentioned in another thread that the fuel system in this...

Slow down, not guaranteed that you need to pull the heads yet yall are jumping the gun. Pull the valve covers and measure the length of each valve. Rotate the engine over so every valve is measured when it's open, and when it's closed. If one is shorter than the others than that valve is bent...