[Rich Biebel]

Can you verify that oil pressure is never lost during a run ? You could use a go-pro camera and focus on the gauge....poor mans Racepack...
Did you ever consider using an Accusump...to help maintain pressure in case it drops?



Timing is to high and could be knocking the bottom end out of it...detonation as Bill C. mentioned will kill any engine...
No reason to be that high...... a small cube engine with giant domes in small chambered heads in a heavy car might like 40-42 degrees but not for long if it detonates...

That engine sounds like an old school modified engine.....2-660 carbs....

8800 rpm is a lot......and hopefully has titanium valves and the best valve train pieces to be reliable....