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A six link is a suspension that integrates upper control arms into the 63-79 Corvette independent rear suspension. It purpose is to reduce camber change of the rear wheels to near zero to aid in straight line traction (drag racing) and in autocross/slalom type events. It keeps the tire flat throughout the entire suspension travel, something a stock IRS has trouble doing. The "6 link" is derived from having three links on either side of the suspension (upper arms, half shafts, and lower strut rods).
What 6 link is referring to is the number of links PER SIDE on the suspension system in the rear. This is a rather odd number of links for a suspension to have.
The production C3 suspension is somewhat of a modified trailing arm setup. The axle halfshaft actually serves as the upper suspension member, therr is a lower camber lnk and then the trailing arm.
The 6 link basically, based on the pics I've seen, no longer uses the halfshaft as a stressed suspension member. It adds a PAIR of upper links above the halfshaft, replaces the lower camber control link with a pair of links and replaces the traling arm with a pair of links as well, resulting in six links per side. A rather unusual setup. :)
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.