Like I said. I personally have proof that #62 coded heads were factory installed on at least one non factory air conditioned Firebird 400 in 1969. When there's one there is more than one..... Undoubtedly. And there's a lot of other owners that claim it too. The car that is my proof is a very low mileage car that is documented in every way. One owner. Pictures. ProTecto Plate. Build sheet. PHS. Original title. Perfectly dated heads. And the best part, the owner didn't even have a clue about it. He had zero reason to swap the heads. Zero reason to hide anything. It is definitely a fact that the car had 62's from the factory and no air conditioning.