[Dave Rifkin]

Lynn,

I agree 100% that the C3 "bumper" Corvettes are extremely under valued and are the bargain of the collector car world. In fact, I actually was hoping to be able to purchase a 1970 Z28 to replace the one I had as a teenager but, due to the skyrocketing values at the time I had to "settle" for my Corvette.

Regarding the GC code, I had a hard time finding any reference to that code as well but, found it in my copy of Rick Bizzoco's 1969 Corvette Guidebook. In the book he lists 4 codes for the L46 engine;

HW = L46 with 4 speed
HX = L46 with 4 speed and AC
GC = L46 with K66 ignition
GD = L46 with K66 ignition and AC