[Z06] What does the "Z06" stand for?
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VetterMan
The Best of Corvette for Corvette Enthusiasts


"Z" has always denoted performance optioned Corvettes starting with the '63 Z06. Throughout the history of Corvettes, most of its performance optioned models had the "Z" designation. It was used again in 1970 on the LT1 powered ZR-1 which ran through the 1972 model year. A big-block version with the LS6 (first use of this engine designation) in 1971, the ZR-2 (one year production only). Very rare with only 12 produced.
And of course during the C4 production years, the competitive models were the Z51 (base engine cars) but later in 1989, the ZR-1 was introduced with the LT5 DOHC Lotus-engineered firebreathers.
2001 marked the reintroduction of the moniker, Z06 optioned with the all new 385 hp LS6.
Tire manufacturers by the way use the "Z" designation for their ultra-performance speed rated tires too.
"Z" prefix options have traditionally been reserved for "special performance equipment packages". The letter does not stand for Zora! Special performance equipment packages usually included some combination of engine, drivetrain, brake, and suspension equipment bundled together as a package. The first Z-prefix RPO, Z-06, became available in 1963 and included HD drum brakes, HD suspension, and a 36 gallon fuel tank. It was designed for production class club and international endurance racing. The 36 gallon fuel tank was unbundled in the second half of '63 production, and for '64 all the equipment was completely unbundled to separate options. Though Z-06 was not available in 1964, you could buy all the equipment that made up the '63 Z-06 package by ordering the appropriate separate options. Don't ask me what happened to Z-01 through Z-05. They weren't used, at least in the early days.
Other well known special performance equipment packages include the '69 ZL-1 with the all aluminum big block. In 1970 the ZR-1 package became available, which bundled the LT-1 engine with HD cooling, suspension, and brakes and was followed by ZR-2 in 1971, which bundled the LS-6 big block with other HD parts including suspension and brakes. (BTW the term "heavy duty" was Chevrolet's euphamism for racing, since management frowned on any overt attempts to support racing.) Following he demise of mechanical lifter engines due to emission regulations, these two packages were replaced with Z-07, which bundled just the HD suspension and brake parts for 73-75.
Of course, ZR-1 is better known as the option code for the "King of the Hill" C4 Corvette from 90-95. Z-prefix options were available throughout the Chevrolet model line, such as the '63 Z-11 full sized Chevrolet, which included aluminum front end sheet metal with the dual quad 409. It was focused at drag racing. Other historical Z-prefix options are Z-29 GT equipment for the Vega and Z-09 Cosworth Vega,
Z-prefix options were not part of car guy vernacular back in '63, but it was the Z-28 option for the Camaro that elevated Z-prefix options to cult status. Chevrolet quickly recognized the marketing value of their esoteric codes for high performance packages, and the rest is history. The '67 Z-28 Camaro was devoid of any special badging as it was a "homologation special" required to make the Camaro eligible for Trans-Am racing, and only about 700 were built, but word quickly spread about this special package and for '68, prominent Z-28 badges were evident, and it was a big hit. Likewise, ZR-1 was not just a production code for the King of the Hill Corvette, but the official model name. They followed suit by using Z06 as the official model designation for the highest performance C5 in recognition of its historical signficance.
Prior to the release of the '01 Z06 only serious vintage Corvette aficianados knew anything about the '63 Z-06 including, of course, the current owners of the remaining 199 that were built in '63, but due to Chevrolet's publicity and word of mouth, most current Z06 owners have become aware of the signifiance of zee-zero-six.
Duke
P.S. The Z-51 option on coupes and convertibles is usually thought of as a suspension option, but it is really a PACKAGE because it includes a power steering cooler. The suspension itself is actually coded FE3, but it is not available separately - only with the power steering cooler. Thus, it's a special performance equipment package and carries a Z-prefix.
[Modified by SWCDuke, 9:54 AM 4/11/2003]
If you ever wonder about RPO or Regular Production Options, look on any factory winder sticker. Each of the three digit codes is on the sheet. Z06 is just another option code. Although in our case it is a pretty cool one. As others have stated other like the Z-11 and the Z-28 denote pretty cool cars also along with ZR-1 and ZR-2. One other one I would like to point out is the special performance package in the C4's the Z07 option which was also a very special Corvette package back in the 60's also.
[Modified by J-Rod, 10:39 AM 4/14/2003]



Living through most of the "golden era" as a close observer gives one a pretty good perspective and a mind full of details and trivia. :)
Duke













