Are all ac delco parts made in the US?

Not all ACDelco parts are made in the United States. ACDelco is a brand owned by General Motors, and while some of its parts are manufactured in the US, others are made in other countries, including Mexico, Canada, and China. The exact origin of a particular ACDelco part can vary depending on the specific part and its production schedule. If you are interested in knowing where a specific ACDelco part is made, you can check the packaging or contact ACDelco directly for more information.