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I really doubt the premise that the C7 has affected the C4 prices in any way. The C4 is just an old car now. There are too many for it to be a collector car except for the ZR-1.
This is not entirely true, the C4 Grand Sport and any C4 with an LT4 option are highly collectible.
You car is just slightly more rare than a base convert. Get over it...
Just for reference. There were over 120k base model produced 05-13.
There were roughly 28k GS produced from 10-13. Yes it's much more rare. About 27k zo6 were produced 06-13.
I believe the GS will hold its value for a few reasons. First, it has the ls3, which many prefer over the beloved 427 due to the valve issues. Second, pair the engine with the wide body and you have a solid platform for reliable performance.
Lastly, there have been roughly 80k base c7 produced, which have flooded the market. The style is subjective, but imo will not age as well.
By no means do I think the GS is some unique car that demand a premium, but it does have many positives over other models.
2025 C8 Stingray of the Year Finalist - Unmodified
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2552 427 convertibles in 2013..................the last NA big displacement engine to be offered in the Corvette line-up............ and agree with you on the C7's.... way too many produced......now the GS version to help "prop up" sales and interest until the next best thing comes along.................
all will depreciate, some more than others, but AUTOMOBILES manufactured in the 2005 - 2013 time frame will not appreciate until the 2030's if at all..................
and ruxvette's comment was more of a poke towards me than anything else.....................
I do think more people will be interested in clean low mileage GS than base cars, just for aesthetics. High mileage cars I think it will be flipped as the base cars is significantly cheaper to operate and own, so the value buyers will want that.
If GM doesn't do another 7 liter in the C7 (sounds like they won't) the 427 vert will be the really collectible one. Then the special edition rare cars like the Carbon Z06s, the CE cars, the Ron Fellows cars, etc. Will have their buyers who want them.
I think the time to buy a 427 will be in like 3 years, prices should be in the 40s for super clean low milers, and they probably won't really fall from there. Plus nobody will be looking at them, everyone will be looking at the new zr1 c7, talking about how the c7z is so cheap, etc.
The other car to buy soon IMO is the camaro Z28 with the ls7. LOTS of insanely low mile cars out there now, but they're all in the mid to upper 40s and low 50s. In 3 years those will be in the 30s, probably low to mid 30s, and be a great collector. I think they won't have a lot of hot rod appeal, as they're not actually any faster than an ls2 c6, so their performance bargain isn't there.
I think my Grandsports are worth more to me than anyone is willing to pay for them.. not sure what that says about GS, ugly tailights on a C7 or C4 values.