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I've been running a DieHard in the IROC and am totally satisfied with performance from it and Sears. When the Vette needs a battery it will be a DieHard.
I just bought an optima battery at Pep Boys, and they actually listed one for the Corvette. It fits perfect, you just have to cut two tiny tabs off the battery tray. I think the one you need is a 75/35, but don't quote me on that!