Guess that noise

skep419 said

This was my first engine build from start to finish. I didn't have high expectations. I only checked a couple rods/mains but they were all the same. Ring gap was at .020 (also only checked a couple) The crank was from one engine, rods and pistons from another, nothing balanced. Block has ate 5 sets of rods/mains. The fact that in ran at all was a surprise.

Thanks for clarifying that it wasn't the oil pump.

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Talk about learnig the hard way!
If you want to learn how to properly rebuild an engine and get good results you need to become a student of the practice. Read, take classes, communicate with others. The parts are to $expensive to keep doing it wrong - "ate 5 sets of bearings". Or have a qualified engine shop build out your long block, it will most likely save you money in the long run.
Good luck and happy hunting.