Quote:

Should he take into consideration that he has Aluminum heads which grow more, and need a little more preload?



IMO No, the potential for change is miniscule, IE: hydraulic lifter preload can be between .020 to .040. I doubt the aluminum heads will change enough to impact those numbers significantly.
If one is going for the last 2 HP then do the adjustments HOT, OUCH on the fingers LOL.

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