When to worry about engine noises?

RustyRatRod said

But we are on track. You're the one STILL arguing about shaft mounted rockers which the OP's engine DOES NOT have. So, the Chevy argument is a valid one.

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Then take the rockers out of it if that makes you feel better.

Why are the lifters clattering? Could it be that the oil pressure is so low AT THE LIFTERS they are pissed off?

Maybe?

Because the pressure on the gauge is not what’s at the lifters. Especially the 5 and 7 cylinders which are at the end of the line.