13398SD

The 13398SD radiator is a direct-fit replacement designed for Cadillac, Chevrolet and GMC Applications (see the chart below for vehicle applications). Built from premium-grade aluminum, this Severe Heavy Duty radiator is constructed to meet OEM form, fit, and function while delivering enhanced cooling performance under the most demanding conditions. Each unit is individually pressure tested and features cadmium-plated tubes inside and out to help prevent premature failure and extend product life.

Unlike many aftermarket alternatives, OSC maintains OE integrity by utilizing stainless steel plate or copper and brass concentric coolers where originally equipped, never substituting with aluminum. A precision die-cut gasket ensures a secure, leak-free seal, while all necessary hardware, fittings, clamps, and bushings are included for a complete installation.

Beyond OE. Built for Better.
The 13398SD is engineered to exceed expectations, delivering premium cooling performance without the premium price.

Kit Specifications:

• Core Width: 34″
• Overall Width: 42-3/4’’
• Core Height: 16-5/8″
• Height: 20-3/8’’
• Core Depth: 1’’
• Overall Depth: ”

Key Performance Advantages: More Tubes, More Cooling Increased tube count (43 vs. 39 OE) improves coolant flow and heat transfer for better engine temperature control Smarter Fin Design Higher fin density (44 fins per inch vs. 40 OE) maximizes airflow and heat dissipation Bigger Tubes for Greater Strength  Larger and thicker tubes (26mm core/ 2mm tube vs. 24mm / 1.8mm OE) increase durability and cooling efficiency Stronger Seal Life Steel crimp strips provide a tighter, more consistent seal for leak-free performance, even in extreme conditions Complete Installation Ready Includes all essential hardware

Steel-Strength Transmission Cooling OSC Severe Duty Radiators feature transmission coolers with a robust 7 stainless steel plate design, compared to 6 aluminum plates in OE and 5 in typical aftermarket units, enhancing both thermal efficiency and long-term durability. The OSC 13398SD Radiator sets a new standard in cooling technology, stronger, smarter, and ready for the road ahead.

Reference Chart for vehicle applications.

13398SD Instructions