Rebuilt bottom end. Break-in procedure.

[KenC]

I'm picking up my freshly rebuilt bottom end on Thursday. I'm having them hone the walls, and install new rings and bearings.

What is the break-in procedure when I get it all put back together?

[twistednut]

I was wondering when you were going to ask this. There are so many different opinions on this procedure. Here is what I just did.
1. no belts, no plugs, use starter to spin motor to get oil flowing.
2. put alt/water pump belt on and install spark plugs.
3. start motor and run between 1k and 2k rpm until warm.
4. let sit until it has completely cooled down.
5. first drive, go between 20mph and 65 mph using 3rd and 4th gear ten times.
6. change oil. Put other belts back on.
Here is where I deviated from the Porche 928 break-in procedure I was following.
7. I drove the car on at least a 50 mile run going in between 3rd and 4th increasing the rpm each time I cycled through the gears. By the end of the run I had broken the 5k mark a couple of times.
8. Next couple of days I drove it around town like I normally drive. Shifting between the 3.5k to 4.5k mark.
9. With about 180 miles on it I started DD it on my 120 mile round trip commute.
"Break it in the way you are going to drive it"
During my daily drive I have taken it up to the 5.8k mark a couple of times.
I've got about 800 miles on it and am changing oil before it breaks 1000 miles. It hasn't burned a drop of oil and it runs like a champ. Almost as good as my other Dinan chipped 200,000 mile m42.

*Disclaimer*
I am not recommending this procedure in any way. This is just how I broke in my m42.