Taking the time to do a proper break-in proceedure is the number
one priority for any engine, no matter what factory it comes from.
Just letting an engine idle on the starterbox for a while isn't what
I would call a break-in proceedure. Trying to get an optiminum
tune and pushing and engine too hard, before the engine is
broken-in properly WILL cause you nothing but headaches.
There are buku posts in every engine thread on this site
about engines that flame out, are hard to tune, had pre-
mature con rod wear or con rod failure. Most all can be
traced back to the fact that the engines are being pushed
too hard before they broke-in. Please don't end up being one of
those, who only has himself to blame.
Take your time and do it right guys. I know it's a pain
in the ars to do, and the excitement of throwing that new engine
on the track and watching it scream is sometimes unbearable.