2003-2004 GMC Envoy XL 4.2L Engine 136K OEM Fitment: 2003/Chevrolet/Trailblazer/LS Sport Utility 4-Door/4.2L 256Cu. In. l6 GAS DOHC Naturally Aspirated::For a 2003 TRAILBLAZER (4.2L, vehicle identification number S, 8th digit) 2003/Chevrolet/Trailblazer/LT Sport Utility 4-Door/4.2L 256Cu. In. l6 GAS DOHC Naturally Aspirated::For a 2003 TRAILBLAZER (4.2L, vehicle identification number S, 8th digit) 2003/Chevrolet/Trailblazer/LTZ Sport Utility 4-Door/4.2L 256Cu. In. l6 GAS DOHC Naturally Aspirated::For a 2003 TRAILBLAZER (4.2L, vehicle identification number S, 8th digit) 2003/Chevrolet/Trailblazer/North Face Sport Utility 4-Door/4.2L 256Cu. In. l6 GAS DOHC Naturally Aspirated::For a 2003 TRAILBLAZER (4.2L, vehicle identification number S, 8th digit) 2003/Chevrolet/Trailblazer EXT/LS Sport Utility 4-Door/4.2L 256Cu. In. l6 GAS DOHC Naturally Aspirated::For a 2003 TRAILBLAZER EXT 4.2L (vehicle identification number S, 8...