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On a 94 LT1 can a 12 inch rotor be replaced with a 13 in rotor? I searched the site but it was tuff finding this answer.
Yes, but only if you also swap out for the J55 calipers & caliper brackets.
Originally Posted by OptiPrime
I use the car for street, never track nor overly aggressive driving.
Is it worth it?
Possibly not for that usage. The 12" system performed well enough to remain standard equipment for all those years, after all. Others may chime in with stronger opinions.