Sale

Cold Case

21-Inch Aluminum Performance Radiator

$828.65 $456.28 Save $372.37

SKU: GMT556A21LSK

In Stock
In Stock
Ships by Aug 29
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Cold Case GMT556A21LSK is a 21-inch aluminum performance radiator specifically engineered for 1977-1987 Chevy/GMC trucks undergoing an LS engine swap with an automatic transmission. This radiator boasts a robust 100% TIG-welded aluminum construction, ensuring durability and efficient heat dissipation. Its polished OE-style tanks provide a classic aesthetic, while the dual 1.25-inch tubes and 16 fins per inch with corrugated design maximize surface area for superior thermal transfer. This performance radiator is designed as a direct fit replacement, simplifying installation. It features a dedicated steam port crucial for LS swap applications and comes pressure-tested for reliability. The oversized 2-row design is highlighted as being more effective for cooling than traditional 3 or 4-row aluminum radiators. For optimal performance, this unit includes dual 12-inch fans and a shroud to enhance airflow.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandCold Case
Part NumberGMT556A21LSK
CategoryHeating and Cooling

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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