how do i know if my 91 is a zr-1 or not?
The following are quotes from the website below. http://www.mcsmk8.com/zr1/90ZR1.HTM "... the tell tale sign of a ZR1 is its extreme width in the back. You cant miss it! It is 4" wider that a regular corvette and uses the massive 315/35/17 tires on 11" wide wheels." "There is an oil cooling system that is larger than most cars entire cooling system. The car has a special version of the German built ZF 6 speed transmission, another radical move on GM. The car has a self adjusting suspension, known as the "FX3", and even more."
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