I copied this from the Welcome Wagon section and put it in the thirdgen specific section hoping more guys would see it there.
Welcome. Sounds like a pretty interesting car. Can you post some pictures and share the window sticker?
I didn't see any of those options in the Camaro white book, but they must be documented some where. I thought by 1985 GM had realized their error in not keeping good production records.
From the Camaro Performers article:
The California IROC was a special (one year only) 1985 IROC promoted as a special edition and only available in California. The 1C5 designation comes from the RPO code associated with the $75 credit on the Monroney/window sticker due to the absence of the IROC decals, IROC badges, the louvered IROC hood, and rear spoiler. Other than these items, they were IROC-Zs. The only IROC-Z lettering was on the wheel center caps. Out of 180,018 ’85 Camaros built, a total of 502 California IROCs were produced. They were available in two colors: black and red (supposedly 101 black and 401 red). Two were made for promotion (one in each color) and 500 were made for public consumption. All of them were produced at the Van Nuys GM plant. There are many urban legends about why these IROCs were built. While doing research, I found that the GM archives office had minimal information on these cars. Only the people involved with designing/optioning the California IROCs at the plant know the real history.
I can totally see why someone might want IROC Z performance without all the decals and other flair. I just wonder why it was limited to California?
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I'll post some pictures and the SPID with the RPOs when my son can come over and give me a hand with it. I always seem to mess it up.
As far as being in the Camaro White Book it isn't in the 1967-2002 issue because the person who wrote it, Mike Antonick wasn't even aware that it existed. He got all his information from the GM Chevrolet archives for the book and it wasn't found within the GM archives. Mike Antonick is also the author of the Corvette Black Book of which he has written many editions.
I brought it to his attention about this IROCZ before his new book was written. I supplied all the documention on the (1C5) 1985 IROCZs that I had and he included the RPO (1C5) in this newest edition around 2009 or 2010 as the "California" IROCZ option. He was nice enough to list me as a contributor to information along with others in the beginning of this book.
Another RPO (Z5V) is on all SPID sheets of these cars, but not listed on the Monroney/window stickers as is the RPO (1C5) detailing what it was and it's cost. So you won't find RPO (Z5V) in the Camaro White Book since we haven't found documentation as to what it truly was in the building of the car, so the search go on.
I tried to find his newest Camaro White Book on Amazon and can't hardly believe what somebody is selling it for! It is for $1,827.93 and another for $1,501.27 in used condition by two sellers! I have to look into this and see why the prices are so ridiculous! I'm glad he sent me 2 new unused copies of it that are autographed along with a letter of thanks when it was published about 8 or 9 years ago.
Try this link to that book and I hope it works.
Here is a front and back view of my car with the black 1C5 in the Chevrolet ad between it.