First of all click on this link http://www.autozone.com/shopping/vehicleSelect1.htm I will be using a Scottsdale C20 4bbl 5.7L as an example 1. Select the year. (1976) 2. Select the make. (Chevrolet) 3. Select the model. (C20 3/4 ton P/U 2WD) 4. Select the engine. (8 cylinders L 5.7L 4BL) It has vast guides to procedures. It also has a specifications sections and a components section. Much like expensive books all compiled into free access database!