Pieces of steel in cylinder??

krazykuda said
Incorect...

What you are seeing it the witness mark from the oil feed hole that is drilled through the main to feed the lifter galley... That hole is not centered, but offest slightly and you are seeing that...

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Notice how the holes for the oil feed holes for the lifter galley are offset toward the passenger side of the block here... You can tell it's the passenger side because that's the same side as the oil filter mounting...

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Here I have circled the marks on the back of the bearings for those holes, I bet if he turned the bearing over, they would be on the opposite side of the anchor slot/tang...

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I have highlighted the oil feed holes in the block here, as you can see, they are slightly offset and there is block material all the way up to the hole, where the center hold that feeds the cam bearings is counter sunk...

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These witness marks that I have highlighted in blue are the halo from the counter sunk cam bearing feed passages...

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Here are the cam bearing feed passages to show where those marks came from...

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The material in the holes here is the bearing material that was sheared/smeared when the boundary layer lubrication was lost and the bearing took the brunt of the force like it's supposed to... When the material was smeared and moved, it had to go somewhere, so it filled the holes... The bearings are made to be softer than the crank journals so they take the brunt of the damage to help minimize what the crank sees... This helps save the crank from damage when these things occur...

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Early small blocks like my 1970 340 do not have the counter bore around the oil feeds therfore cause oil starvation in even moderately high rpms.
Ontop of being too small the bearings oil holes also sit offset toward the intersection of the cam oil feeds... which is right above the restrictive small v shaped opening where the 2 intersect...you starve the motor that way. Pretty easy to put together I would think.
Shadow, witness mark... terminology differs, you reword what I say with your typical smugness and intent on correcting someone... and you still miss my point.
Sad.