Old thread but one that is worth reviving.
Fresh rebuild on a 440-495. I just drained the oil and pulled the pan to fix a rear main leak and noticed the silver-gray shimmer in the oil. I always worry about cam and lifter failures so this had me worried. I used Driven Hot Rod oil, 10 w 40 and NO additives since recent reports have shown that it is best to just choose the right oil to begin with and to not use any additives.
I'm going to put the pan back on, fill it with fresh oil and see how it runs, and how long it runs.