ACDelco is or was a GM Brand for GM to sell parts to the public. Has been mostly just a Brand for 20+ years that generate High $ markup to GM and and nothing better for most things sell to you but loves your wallet.
Is about the only place to get battery cables for side term batteries with correct battery end. Nearly everything else is really made by low bid winner for X number of years. Is why Oil Filters have change a lot when the contract gets rebid etc.
In Short, Delphi Was a Spin Off of All GM Parts Divisions.
Harrison AC
Packard Electrical
etc.
Delphi went "Bankrupt" soon after spinning for several reasons and moving many to most parts to China and other places even then.
Delphi went Bankrupt again in 2008 has spit in several pieces...
Delphi Tech is just part of BorgWarner Inc.
Some sold back to GM.
Delphi Automotive Systems is now Aptiv plc in Dublin, Ireland.
Delphi/Aptiv = nothing now for Retail Parts.
walbro fuel pump are good but often hard to find real ones. They too get counterfeited big time.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave