【Construction】- Made of High Quality Full T-6061 Aluminum Construction. High Performance Racing Spec. 3-Row Racing Design 【High Performance】- Improves Cooling by 35 - 45% Temp, Make Heat Dissipation More Efficient to Prevent Premature Engine Failure 【Specification】- Overall Size: 28" x 25" x 6.625" / Core Size: 21.750" x 19.250" x 2.250" / Inlet: 1.50" / Outlet: 1.75" / Transmission Cooler Thread Size: 1/2-20UNF 【Fitment】- Compatible with 55-59 Chevy C-/K-Series Truck/ Pickup/ Suburban, Compatible with 55-59 Chevy 3100 / 3200 / 3400 / 3500 / 3600 / 3700 / 3800, Compatible with 55-59 GMC 100/ 150, Fits Models with 3.8L/ 6.1L l6/ V8 OHV Engines ONLY 【Installation】- Highly Recommend Professional Installer for Installation. No Instruction Included