Evergreen TK10437CWP 07-11 Chevrolet GMC Hummer Isuzu 2.9 3.7 DOHC Timing Chain Kit Water Pump (with Gears) Fits: 07-12 Chevrolet GMC Hummer Isuzu 2.9L DOHC 16V / 3.7L DOHC 20V (see description below) Meets or exceeds OEM performance requirements Utilizes the latest in design and material technology, ensuring quiet and maintenance-free experience Premium quality link belt type timing chain for exceptional durability Ideal for stock replacement and mild performance applications