1999 GMC Sonoma Owner's Manual - Page 305

yellowblue Replacement Bulbs Lamps Halogen Headlamps, Composite Low-Beam Halogen Headlamps, Composite High-Beam Tail and Stoplamps Front Sidemarker Lamps Front Turn Signal Lamps Center High-Mounted Stoplamp Quantity 2 2 2 2 2 2 Number 9006 HB4 9005 HB3 3057 194 3157NA 577 Capacities and Specifications Engine Type VIN Code Firing Order Horsepower (T Series) Horsepower (S Series) Thermostat Specification Spark Plug Gap 2.2L L4 L4 4 1-3-4-2 N/A 120 at 5,000 rpm 195_F (91_C) 0.040 inches (1.01 mm) "VORTEC" 4300 V6 V6 X 1-6-5-4-3-2 180 at 4,400 rpm 175 at 4,400 rpm 195_F (91_C) 0.060 inches (1.52 mm) "VORTEC" 4300 V6 V6 W 1-6-5-4-3-2 190 at 4,400 rpm 180 at 4,400 rpm 195_F (91_C) 0.060 inches (1.52 mm) 6-67