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I thought only 18 LS6 Converts. were made....

I could swear I've seen a good 20-30+ come up for sale in the past 10 years

is it just me?
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For a long time the general consensous was 18-20 cars but over the last few years more than 30 have been documented. If you talk to the researchers, they pretty much believe the real numbers to be in the 200+ range. Based on what has surfaced just in the last year or so, I would have to say those are likely very accurate figures.
Rick