Im just finishing my 347 build and was wondering what type of oil is ok to break it in with? It has moly rings if that makes a difference. Im reading two different things, some say to use a non-detergent oil and some say to use regular oil like 10w40. Which do I use?
Change the oil and filter asap. Then after that oil change change it again a week or so later. This is what I did. Now i'm waiting for 500 miles to start using synthetic. I asked marc o'neal from coast high and he said about 500 miles is fine.
The oil type and weight can change, depending upon what was done for the build. And if there are issues later, it can come back to bite the user for not having done what the builder/machinist (I say machinist since it sounds like you put the mill together yourself) wanted.
for instance, one can do the machining to accept a synthetic right off the bat.
The info that Mike posted sounds very good to me, but I would ask first (like how Mike asked Rick what to use).