i think its blowed

I have ran 20 seconds plus with no oil pressure, WOT, 4500+rpm, when I pulled the engine down 20K miles later, the crank looked like new.

Same truck, (71D200) had a front sump pan, and was quick enough to lose pressure from the top of first through the top of second, did it a lot, like I said above, crank was perfect. (But what is good for the goose, isn't good for the gander)

Put a lifter in it, replace the rocker, and dont rev it so high.