【Fitment】- Compatible with Chevy C10/C20/C30/K10/K30 Pickup 1963-1966; Compatible with Oldsmobile 88 1961-1962/ Dynamic 1961-1962 / F85 1964-1965 / Cutlass 1965-1966; Compatible with Pontiac Bonneville 1961-1966 / Grand Prix 1962-1964 / Catalina 1961-1966; Fits Manual Transmission Only; Fits models with 3.8L/ 3.9L/ 4.1L/ 4.3L/ 4.8L/ 5.0L/ 4.6L l6/ V6/ V8; Might require modification to fit 5.3L - 6.9L V8 models 【Specification】- Overall Size: 25.25 x 22.50 x 2.75 Inch. Core Size: 23 x 17.25 x 2.25 Inch. Inlet/Outlet Diameter: 1.75"/ 1.75". Transmission Cooler Thread Size : G1/8 【Construction 】- Constructed of High Quality T-6061 Aluminum Construction. High Performance JDM Spec. 3-Row Racing Design 【Feature】- Light Weight Direct Bolt-On OEM Fitment or Replacement. Stronger & Higher Capacity for Coolant than Stock Units 【High Performance】- Highly Increase Cooling Performance; Make Cooling System will be More Efficient