Bryce wrote:I wasn't aware of the brass coating
Just so it's out there, it's not a brass coating. It's coated brass. Actually there are 3 materials typically, the main being brass. They take 2 soft metals (brass/copper) and coat them with a harder material like zinc/tin. This gives them a silver look, but the coating is very thin. If the oil film ever breaks down or is compromised in any way, you'll see a gold colored witness mark where the coating was worn through. Hence when a complete failure of the oil film happens, the gold colored shavings (particles of brass/copper)are found.
BB450 - I'm in Michigan. If you (or anyone else) splits the cases, there are some "automatic" replacement parts like main crankcase bearings/seals, timing chain, etc. Consider it "cheap insurance" since the cases are already in half. Keep asking if you still have questions...