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**Boog** · 12-23-2021, 11:33 AM

I have long thought all GM's had HEI ignition since 1974 until now.
When looking up ignition modules at O'Reillys and Rock Auto there are GM genuine HEI and W/O HEI ignition modules available. The images and info are the same so what gives?
Also an AC Delco module listed for my 91 looks nothing like the others.
Who is GM genuine if not AC Delco?

https://www.rockauto.com/en/catalog/...ule+(icm),7172

12-23-2021, 11:33 AM	#1
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,001	HEI or not ? I have long thought all GM's had HEI ignition since 1974 until now. When looking up ignition modules at O'Reillys and Rock Auto there are GM genuine HEI and W/O HEI ignition modules available. The images and info are the same so what gives? Also an AC Delco module listed for my 91 looks nothing like the others. Who is GM genuine if not AC Delco? https://www.rockauto.com/en/catalog/...ule+(icm),7172 __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross Last edited by Boog; 12-23-2021 at 11:43 AM.