[TimG427]

The Grand Sports did have disc brakes right out of the gate. When you said drum brakes, I wasn't sure if you meant the production Corvette or GS. The Production Corvette had drum for 63 and 64. The hard cover book on the GS shows good pictures of the completed chassis with no body. The disc brakes on the GS were non vented type, still lacking over the production 65 units.