GM QC...

[tribbles]

So I finally tore down the 3100. I was cleaning the camshaft when I discovered this on the lobe closest to the oil pump drive gear:



Looks like quality control missed this lobe. I haven't looked at the corresponding lifter yet. It's not a big concern for me since the yard's pulling a 3400 for me right now, but thought I'd share.

[tractorman]

That's from wear. I see it all the time on roller cams in diesel engines.

Don't ask me why the metal flakes- I don't know. I just know that it does.