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They ran at Sebring last Friday, Corvette was 1 of 13 with a full lap lead in the GTE AM category. All of it was telecast live on the Motor Trend channel. They run the 2nd car in the WEC so they can run both cars at the LeMans 24 hour, with the GTE PRO car converted to GTE specs, which is not a major change.
Next year they will have their GT# version ready and will sell customer race cars perhaps the following year. They are required to make some minimum number of GT3 cars, I think it is 20 some for sale to private race teams. They had a waiver from IMSA last year and this year where all their competition are GT3 cars and Corvette is running a decontented GTLM car against the GT3 competition.
I believe this season so far is just two yellow C8.Rs: No. 33 for the GTE Amateur category (Ben Keating is the amateur in its roster line up) which I read is not reusing any existing chassis (not Nos. 3, 4, 63, nor 64) but was built from scratch. And No. 3, the same old yellow one in the GTE Pro series. Both are planned to race in Le Mans.
Last season (2022) was predominantly the No. 64 car which was originally the silver No. 4 car in prior seasons but they put the yellow No. 64 livery on it. Before that season (2020, 2021), Nos. 4 and 64 were silver, Nos. 3 and 63 were yellow. I think Nos. 63/64 were used for Le Man while Nos. 3/4 were used for the regular season.
You can track general activity (esp. visually) on Corvette Racing's Twitter page. On there I'm only seeing the yellow Nos. 3 and 33 so far this season.