Swarf in the oil first service is quite common with the 390. Make of that what you will, but high tolerance and high quality production, maybe not so much.Conversely you don’t want parts perhaps not fully mated to each other in an Engineering sense: unduly forced to excessive stresses at high RPM. ***Although this is probably less so in this modern age of high tolerance mass production. **Seeing lots of ‘swarf’ in the oil come first oil change is pretty much non existent these days…..
Tin hat on and ready for the oncoming flak
I’m running in an engine at the moment and I’m about on board with your suggestions though a Ninties Sportster isn’t exactly modern engine.