There is a section specificaly for those who want to sell engines.
Don't remove the intake deflector when you port the heads.
So what did you order?
General purpose engines or with the heavy fly wheels and A2 goveners?
You should strip the cam and look for grinding grit and push pull the front main bearing carrier and look for grit in oil passages. Wash out the front and rear carriers well grit may be in there. Try Jack's razor blade trick to remove any sand, grit from the front and rear bearings and big end and don't forget to check and scrape the end thrust washers ( crank float is .003 .005 not in the manuals )
Run a brush threw the oil gallery under the IP cover and check for scale and dirt in the oil line feeding the rocker arm shaft. The banjo fittings are brazed and you could wash some flux into the oil from it.
Did you order extra oil filters, no one in Canada has been able ( or willing might be better ) to match the stock Indian oil filters for a Donaldson or quality filter do you have any numbers on that?
Even the tiniest amount of grit in the oiling system will get into the bearings.......
I think most of this damage cam from a dirty cam and dirt that wasn't easily wiped from the oil galleries aftyer machgining.
Found other sand but I realy had to grind and do a chemical strip to get it too move.
http://www.putfile.com/pic.php?img=4482325http://www.putfile.com/pic.php?img=4482333http://www.putfile.com/pic.php?img=4684719Notice the roughness of the casting at the very bottom of the cam cover oil return. This is two small pockets of sand and flash. See the green rough spot the stripper wouldn't remove, this is a pokcet of sand and flash. This is the sort of thing your looking for if you don;t touch it it may never move, but to remove it you need chemicals and a dye grinder