Breaking in new short block

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Originally Posted By: 9050lx
My machinist used to tell me that with the recent use of plateau honing the rings break in almost instantly.


Your machinist told you correctly. That small part of break in is over before you know it.

The rotating assembly is either right or wrong, no real break in required if correctly assembled.

One of the best engine builders in the country runs his engines on a dyno for a few minutes to build some heat and then runs them at full power. Sometimes for a while. And does it on 10W oil!
 
The word Break-in as we used it in this instance is concerned with the cylinders, piston and rings. A complete break-in (new or completely rebuilt), involves burnishing and polishing sliding and rotation pieces like rockers, lifters, etc. Ed
 
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