This question keeps coming up. People have done it. I've never seen it personally so my opinion probably ain't worth much on this. I measured my C5 from the inside of the outer fender to the inner fender. You'll get 12.5"
A 335 tire is 13.5" wide, I had some on my truck. It needs to be mounted on a wider rim than 11.5" By mounting them on 11.5" you will be pulling the sidewalls in. Some say that will protect the rim. I have 295's on the back of mine. They are mounted on 11.5" wide rims. If you stand a yardstick against the sidewalls they line up with the outside of the fender.
I can barely slide my finger in between the inner fender and the sidewall.
That's about 1/2". To me, and it's just my opinion,
:troll :hat :conehead (<-that's me) that by pulling the sidewalls in, you are turning a 335 into a 295. A 335 is not designed to fit on an 11.5 rim.
http://corvetteforum.com/techtips/vi...D=36&TopicID=1
I'd go with tubbing if you don't have a vert and offset inward.
[Modified by vrumvrum, 6:38 AM 3/2/2003]