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Wow, did not see that coming... With this kind of single-minded focus, drive, and productivity you are married? That is one special woman, hold onto her! :beer: -- Carl

Could the pushrod have started to bind, causing the valve to kiss the piston, and causing the rocker arm to have to push "harder" until it hit the point where the rocker arm broke? Could raising the oil pressure have had anything to do with it?

I'm glad you found something definitely wrong. I hate it when I do a bunch of investigation with nothing specific to show for it. I hope I never have to get into my engine like this, but it gives me confidence to know that I can draw on the expertise of all you rocket genuises if I do! :)

Understood, good idea. Suggest you diagnostically eliminate the parts of the fuel system after the gauge.

The pressure that you want to know is further along, like where the last injector pulls off the fuel rail. If you've still got pressure there when it starts to die then it's not fuel pump related. With an undamped gauge you'll see a range of pressures as the injection pump draws on the supply...

Where and how are you measuring your fuel pressure? Seems like you could do a dead head test that looks great but still have an issue that manifests in a certain window of operation. -- Carl

My fuel pump thread might be helpful: MEP-803a AirTex fuel pump substitution