Radiator for Chevrolet C10 C20 C30 K10 K20 K30 (1973-1987) 7.4L (4 Row)

Heavy-Duty 4-Row Aluminum Radiator for 1973-1987 Chevrolet C/K Trucks (Rounded Line / Squarebody)

What it Does: The 4-row aluminum radiator replaces the failure-prone factory cooling unit on 1973-1987 Chevrolet C/K Trucks to maximize thermal dissipation and eliminate chronic overheating under heavy load.

The Stock Chevrolet C/K Trucks Radiator Weakness

Factory Squarebody cooling assemblies were engineered with copper-brass or crimped plastic-and-aluminum cores that degrade over decades of heat cycling. In the high-displacement Mark IV Big Block 454 (7.4L), high coolant temperatures exacerbate solder fatigue, calcification, and fin corrosion. The restrictive 2-row and 3-row stock designs cannot shed BTUs fast enough during low-speed crawling or heavy towing, creating severe thermal soak that risks warped cylinder heads and blown head gaskets.

The Engineering Solution

This replacement radiator features an all-aluminum 4-row brazed core with high-efficiency louvered fins, delivering a massive increase in heat-transfer surface area. The TIG-welded aluminum end tanks eliminate OEM crimp seals and brittle composite plastics entirely, resisting structural failure under elevated system pressure. Standard 1.5-inch inlet and 1.5-inch outlet ports sustain optimal coolant flow volume, preventing laminar stalling and maintaining stable operating temperatures for high-torque big-block applications.

What's Included

• 1 x 4-Row All-Aluminum Radiator

Technical Specifications

Compatibility

• 1973-1987 Chevrolet C10 (7.4L 454 V8)
• 1973-1987 Chevrolet C20 (7.4L 454 V8)
• 1973-1987 Chevrolet C30 (7.4L 454 V8)
• 1973-1987 Chevrolet K10 (7.4L 454 V8)
• 1973-1987 Chevrolet K20 (7.4L 454 V8)
• 1973-1987 Chevrolet K30 (7.4L 454 V8)

Frequently Asked Questions & Fitment Warnings

Does this fit the Squarebody C/K Trucks?

Yes, this is a direct fit for the 1973-1987 Chevrolet C/K Trucks equipped with the 7.4L 454 engine. It utilizes the original core support mounting locations and factory hose positions.

Do I need to perform a cooling system flush during installation?

Yes, a complete chemical flush of the engine block and heater core is required prior to installation to prevent legacy sediment from clogging the new aluminum passages.

The Chevrolet Durability Standard

Engineered for relentless work cycles and high-load towing, this radiator provides the robust thermal overhead demanded by heavy-duty Chevrolet workhorses.