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That's an RPO Zora and his team came up with as a special performance package in '63. RPO = Regular Production Option. Like the Z28 RPO, it doesn't stand for anything specific - it's the alphanumeric designation that becomes a moniker due to the popularity of the model.
As already stated, that was the RPO code in 1963 of which there 199 produced that year. However it is not an RPO for the C5 generation, but a model designation.
Z06 is the RPO for the 1963 racing/performance package. As stated for the C5 and C6, it's a model code. The RPO on my Commemorative Edition Z06 was RPO Z16, thus you will see the CE Z06 referred to as a Z16.
RPO Z16 is used for the current Grand Sport, as it was also for the 1996 Grand Sports.
Here's one of my favorite pictures, showing my Z06/Z16 next to a Big Tank Z06. (even less than 199 of them around)
That's an RPO Zora and his team came up with as a special performance package in '63. RPO = Regular Production Option. Like the Z28 RPO, it doesn't stand for anything specific - it's the alphanumeric designation that becomes a moniker due to the popularity of the model.