I have seen people mount P315/35/ZR17 on a 17x10 wheel with no issues and get ten's of thousand's of miles on them when the car is driven normally (not raced or used as an SCCA corner hugger/canyon carver). If the car has ABS brakes I would stick with 17x11. Especially if it's a ZR-1 Corvette.
Lets put it this way: I personally have used tires on wheels that should have been 15x8 instead of 15x7 and 14x6 instead of 14x7. This was both on First and Third gen Camaro's. However none of these cars had ABS, tire pressure monitors, vehicle ride height adjustors, etc. I think you know what I am getting at. If you are still not sure then look at the disclaimer on the bottom of the link above.
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