Hello All,
New comer here with a question. Just acquired a 1970 Grand Prix with a 400 that had been garaged for the last 20 or so years. After a little bit of tinkering and a new timing chain set it's back on the road. My question is in regards to the sticker on the fan shroud stating " Engine Modified To Use 97 Research Octane Premium Fuel ". It states that this is a factory modification. Could anyone enlighten me as to exactly what that sticker means ? Any help would be greatly appreciated.
Thx,
Mike