Welcome to Kamashaa Motor, My Distinguished Guest, Keep On Smiling and Shopping NOW !The aluminum radiator is designed to provide maximum cooling efficiency to prevent premature engine failure.Its lightweight and high heat transferring aluminum features a tube and fin design,that dramatically increases surface area that enables the heat to dissipate more efficiently.This Aluminum Radiator is at least 35% more efficient than stock ones.Most importantly,it has a much higher capacity for coolant than stock ones,which means that your cooling system will be more efficient and will be more resistant to temperature surges in racing applications. Specifications: High Performance Racing Spec. Core Material: All Aluminum Tank Material: T-5057 Aircraft Grade Aluminum Surface Finish: Aircraft Grade Raw Aluminum Core Height Between Tanks: 37-1/8" Core Width Fin Area Only: 19-7/32" Inlet Neck 1-3/4" Outlet Neck 1-3/4" OEM part numbers: 15797461, 15170906, 15258917, 150113551, 19130050, 1579463, 15013568, 88551, 15170904, 15013546, 15797463, B1449, 1003639, 1003639AN, 1003636AS, 12082101, 1003638, 1003638AS, 21693, 15258918, 19130049, 15797462, M2947001, S6705001 Fitment 1: For Chevy 03-09 C4500 Kodiak (6.6L 8.1L V8) For Chevy 03-09 C5500 Kodiak (6.6L 8.1L V8) For Chevy 03-07 C6500 Kodiak (8.1L V8) Fitment 2: For GMC 03-09 C4500 Topkick (6.6L 8.1L V8) For GMC 03-09 C5500 Topkick (6.6L 8.1L V8) For GMC 03-07 C6500 Topkick (8.1L V8) Fitment 3: For Isuzu 05-08 HTR (7.8L L6)