Will 335 30 19 tires fit on a 2002 c5 Z06 corvette?

No, 335/30/19 tires will almost certainly not fit on a 2002 C5 Z06 Corvette. The C5 Z06 uses a significantly narrower wheel in the rear. While the 19-inch diameter might be compatible, the 335 width is far too wide for the stock wheels and would likely rub severely against the body and suspension components. You'd need to consider significantly wider wheels to accommodate that tire size, and even then, there's a good chance of fitment issues.