Re: Running in the Engine
My first advice, is spend an hour reading up, and making your own decision.
There are 2 main camps of bedding in.
Break them in gently. Not being too high revving, dont labour engine etc.
Break them hard. Will be hitting full throttle runs almost straight away.
I'm in the hard camp. I've rebuilt countless engines for my job. As well as replacing blocks etc.
Also rebuilt my own engines, and ran them in hard. Never had issues, always had good power. My last personal engine, after initial start up and leak check, I hit full throttle with in 20-30 mins, and took it to 7k rpm.
Rings do not take hundreds of miles to bed in. The honing on the bores is what your being in with the rings. That initial honing soon wears to a point it no longer 'beds'. After that, there will be no more bedding in of the rings.
Rings need pressure to expand them against the bore. This comes from high rpm runs, and letting off.
Conversely, cams need bedding in completely differently. They generally need to be held at 2-3k (manufactures have their own specs) for quite a while, last set I did was around 20mins.
Engines are generally bench tested before installed. Thought I can't be sure every manufacturer does that. Plus it's already been driven around by factory staff, dock workers, transport drivers, valeters, salesmen, techs.