VERY helpful info HotRodDave! Thank you.

I've had very good luck I guess with several Gen3's I've owned and help others procure.

I do like to to be prepared for IF I have this issue. I print stuff out from here and put in a file folder. Say I do have issues with my 2010 Charger 5.7 and would prefer all new parts instead of machining heads and prefer upgrading material quality instead of OEM.

New heads: what heads would be best?

Camshaft, lifters, valves and springs, etc.

What brand?

I wouldn't mind performance upgrade too but it really doesn't need it and I want to maintain smooth idle and no codes so I'm wondering about question WailinD asked "Since the Apache head flows more than the Eagle head, would the ports be too big for a stock displacement 5.7"?

Also, I'm sure this has been asked but how easily would a 6.1 or 6.4 go into a 2010 Charger? Would it be nightmare of codes and harness issues? I know there would be other future upgrades needed such as axles etc.

Thanks for any help!