Re: Loud Pinging/rattleing noise when under heavy acceleration, hills...
Sounds like a combination of bad fuel, some carbon build up, and also needs a tune up as well too. I'd pull the motor and tear it down and check everything out concerning your internal engine components. There may be a bit of slapping of the piston heads and valves going on. Especially after you just now informed us on head gaskets and new cylinder heads being installed. They weren't checked for proper clearance.
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