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Good thread! The LT1 has an electronic speed limiter of 155 (although not sure if that's been confirmed anywhere). The 155 limit is due to the standard all-season tire rating and is why the LT1 speedo tops out at 160 (it's the same speedo as the T4 and V6 cars). The SS cars don't have that speed limiter and get the 200MPH speedo.
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