Your data might be a little inaccurate OP. The posted time of 4.6-4.9 sec is with 1 foot of roll like on a drag strip. This is how most magazines tested cars until a few years ago when they started posting real ZERO-60 times. In those instances, its more like 4.9-5.5.
There are a lot of variables to take account, like alt., temp., track cond., etc. Also, not all Z's built, produce the same amount of power. Some have a little more, some a little less. A tenth of a second or even half a sec could also come down to who's driving.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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