My Touring Classics front brakes (C5 12.8") are real tight in my 17" centerlines. I am thinking 18"s will be absolute minimun for the C6 Z51 setup. You will have to measure the i.d. of the rim right up to the web on the inside to be sure.
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Twin Turbo LS1 '71 Chevelle
1000 hp 93 octane street car
6 speed
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