Originally Posted by slg

Way too many conflicting views and opinions...

First off, if you have new camshafts they must be bed in by not allowing the rpm to drop below 1500. The nose of the lobes can be damaged otherwise.

There has been a lot of research on the effects of run in procedures.

Doing dyno run-in tunes on a wide variety of engines, our procedure was to put the engine under full load/boost from the very initial stages, This has never caused any issues and was the only way to get a full tune done to get the engines back to work for the customers.

All of my own personal engines have always been driven hard from day one, I've NEVER had any issues at all.

You will get a lot of different opinions, best of doing whatever your engine builder recommends to cover yourself and your warranty.

My 2c...