My paraphrased input lifted out of a Toyota tech article, and the local machine shop, and YOUR end of the deal for a successful rebuild:

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This all goes back to my own experience with being at the 'end of the road' (note my location). You've got to go and talk to the guys and ask them what they can do for you and print out threads like this. In then end, it helps them with their trade, if they're open to experimenting, esp if you want to push the performance envelope.

Some folks here have the money and the extra vehicle to afford them to do this; others have their one and only ride which depends on the reliability they can depend on.

This is IN ADDITION to your mechanic's ability or YOUR ability for all the periphial stuff that is tacked on..
Did you put in new gaskets?
Did you clean your EGR tubes and plate?
Do you have new/calibrated sensors?
Is your fuel pump new?
Are your injectors cleaned and rematched?

Your MACHINIST is not responsible for anything other than the head/block you gave them.
YOU and your mechanic are responsible for the condition of what gets bolted ON TO THEM, including performance or bling-bling stuff.

The machinist can kick you back a good product; what you bolt to it afterward is on you.
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Yep, bein' lazy; sore wrists today. <img src="/forums/images/graemlins/cheers.gif" alt="" />