Hotchkis Sport Suspension 1916 1967 - 1972 GM A - Body Lowering Coil Springs Set (4) 1 in. Drop Big Block. Lower your Chevelle El Camino GTO or other 67 - 72 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 ride. Each gray powder coated coil spring is precision wound using the highest quality steel. Specs 1 in. Lowered Front 580 lbin Rear 124 - 159 lbin. Motor Big Block. (Big Block cars using aluminum heads or many Pontiac Motors such as the 400 should use the small block spring 1901F. ) Note Wagons and El Camino's should not use rear springs without the use of 31750 air bag kit.