Hotchkis 64-66 GM A-Body Small Block Performance Front/Rear Coil Springs SetHotchkis Sport Suspension 1900 1964 1966 GM A Body SB Lowering Coil Springs Set (4) 1 in. Drop. Lower your Chevelle El Camino GTO or other 64 66 GM A Body car with Hotchkis Sport Suspension lowering coil springs. These springs will lower your vehicle on average 1 in. from factory ride height enhancing vehicle looks while lowering the center of gravity. The increased spring rates offer improved performance and handling while offering a comfortable