1972 El Caminos wore single-unit parking/side marker lights on their front fenders, outside of a revised twin-bar grille, but little changed. For 1972, horsepower measurements were switched to the "net" figures as installed in a vehicle with all accessories and emission controls hooked up. Engine offerings included the 110 horsepower (82 kW) 250-6, a 307 V-8, a 175 horsepower (130 kW) 350-cubic-inch V-8, and big block V8s of 402 and 454 cubic-inch displacements. The 402-cubic-inch (still known as a 396) produced 240 horsepower (180 kW); the 454 managed to put out 270 horsepower (200 kW) under the net rating system. Super Sport equipment could now be ordered with any V-8 engine, including the base 307-cubic-inch version. 1972 SS models have a " W " as the fifth digit in the vin number. source:wikipedia