Yes, fresh .060" bore. I always thought KB was a top brand piston. I assume new rod bolts as they were supposed to be reconditioned.

I never found a high volume pump from Melling, just standard and high pressure models.

I came up with another theory:
#1. With the gouges in the cylinder, I figure the engine should have been pumping oil like crazy. All I ever saw was slight smoking usually at fast idle.

#2 That suggests there isn't much oil being splashed on the cylinder walls.

So, how can I have apparently good oil pressure yet very little oil being slung off the crank? I'm thinking a restriction somewhere between immediately before the first bearing and the pump. That would give normal oil pressure yet no flow to the rest of the engine.

I'm grasping at straws now but I have to start somewhere! I'll be looking at the block to test this.

I'm also thinking of mocking up the block without the oil pan and run the pump with a 1/2" drill to see what kind of oiling action there is. I did this before on a SBC with low RPM oil pressure problems and found a leak between the rear cap and pump.