A couple months back one of our members posted on how to remove the steel plugs from the front and rear of the block to clean out the oil passages. I noticed some brass-colored plugs on the side of the block and I'm wondering if they should be removed during a rebuild (circled in red) ? What is behind them?
 There are also two behind the oil tree:
 Also, should the center part behind the oil tree that is threaded in (circled in yellow) be removed during a rebuild or better just to leave alone? Thanks in advance!
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