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engine noise when cold

Engine

Vehicle Information: Year: 1981; Body Type: Coupe;

my car has 79k all records since new,mint condition original car,however it came from colorado,timing and fuel mixture adjusted for high altitude,it predetonated badly untiladjusted to specs by dealer,car runs great,good power,only one issue the engine makes a pinging sound underload when cold,once it reaches operating temp in about 5 minutes,it goes away,the dealer says it may be a head stud.what are your thoughts?

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