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Old 10-05-2016, 07:11 AM   #41
MLL67RSSS
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Join Date: May 2008
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A little explanation on options codes. They've always been grouped by letter; i.e. "A" for interior options, "D" for exterior options, "F" for suspension, "G" drivetrain, "L" for engines etc. and if there was a RPO option that concerned things for various groups engine/drivetrain/exterior striping it would get a "Z" code, the most well know is Z/28 of course. (Z22 was the Rally Sport option, Z27 was the "SS" option etc.)

So back in '02 Chevrolet wanted to have silver SS Camaro convertibles for the Brickyard 400 however they also wanted them to have the special black painted wheels that only came on the 35th Anniversary editions. So they created option code/SPID "Z7D" to accomplish this on the assembly line. Every '02 Brickyard 400 SS Camaro has that code on the SPID.

When the Camaro was to return for 2010 MY there were 25 silver 2SS pre-production cars delivered however they had no special code, just early production cars with almost every one unique low VIN.

In 2010 they decided to again factory build Pace Car Replicas like in '69 so they created option/SPID code "Z4Z".

In 2011 they again factory produced pace car replicas and they again used the "Z4Z" code.

However some years they aren't unique. In 2012 they were just white 1SS convertibles. The blue "LeMans" stripes and all other decals were done here. They have no "Z4Z' or any other special code.

So since they started this tradition whenever a new Camaro has some unique grouping of various option that they want to build a batch of for Indy they pull out the good ole' "Z4Z" code. Last year it was partly because a Summit white Commemorative would normally have silver, not the black, striping.

Since it originated in 2010 for Pace Car Replicas you will see it listed as a "pace car" code, but any new Camaro built to be used at Indy that has unique option grouping, be it a "Pace Car Replica" or a "Parade/Festival car" they use that code.

Since the pace car was a white 2017 coupe you certainly can't say the Hyper Blue convertible parade cars are "Pace Car Replicas."
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