How was the block cleaned before final assembly? I got a block back from a machine shop once and was told "Just put it together" I elected to clean all the oil passages with brake clean and brushes. Lot's of dark gritty stuff came out. I did have a new engine once develop a rod knock after only a few miles and when I pulled the pan there was a pile of black gritty stuff in a small pile under the bad rod...expensive lesson on final cleaning.
The only reason I ask is because I think I see some black debris in your oil pan?
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“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.”
― Calvin Coolidge
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