verrry interesting....
here's my question. what was the design/engineering rationale for these pressure relief valves in the first place? i can see from the oil circulation schematic what the psi's parameters are at a few locations, including for this valve, but it doesn't help me understand.

i'm thinking they wanted to limit the amount of pressure reaching the hydraulic lifters. is this still not a valid reason to retain them? or is it unnecessary overkill?
also, could the increased pressure affect the cam bearings etc in any negative way?

thanks.

here's the parts illustration from the online isuzu parts site looking forward to hearing how this works out for you. www.myisuzuparts.com they are #34



//bc