High Performance Radiator for Chevy GMC C/K 1500 2500 3500 Pickup Suburban (1973-1986) 3.0L 3.8L 5.0L 5.7L

High-Capacity Aluminum Radiator Kit for 1973-1986 Chevrolet, GMC C/K Trucks (SBC / Square Body)

Upgrading the cooling system on your Square Body C/K is essential for preventing thermal breakdowns, and this complete 3-row aluminum radiator and dual 12-inch fan shroud package completely replaces the restrictive factory assembly to lower engine coolant temperatures by up to 45%.

The Stock Square Body Cooling Limitations

The factory copper-brass radiators found in the 1973-1986 C/K generation were adequate for standard duty when new, but they suffer from severe thermal limitations over decades of use. The original brazed joints degrade, leading to microscopic leaks and pressure loss. Furthermore, the inherent thermal inefficiency of the old-school OEM brass cores leads to localized heat soak, especially in the Small Block Chevrolet (SBC) 5.0L and 5.7L engines under sustained load. When subjected to stop-and-go traffic or hauling heavy loads, the factory mechanical clutch fan struggles to pull sufficient CFM at low RPMs, causing dangerous temperature spikes that can warp cylinder heads, compromise gaskets, and degrade transmission fluid.

The Engineering Solution

This engineered upgrade completely modernizes your Square Body's thermal management. Featuring a fully TIG-welded, 100% aircraft-grade aluminum construction, the heavy-duty 3-row core (28.23" x 16.85" x 1.73") maximizes surface area and fluid capacity without the galvanic corrosion risks of mixed metals. Paired with an integrated aluminum shroud, the twin 12-inch electric fans deliver a constant 1600 CFM of targeted airflow directly across the fins, completely independent of engine RPM. The included precision thermostatic relay kit automates the entire cooling cycle—activating the fans at 180°F and shutting them down at 165°F—ensuring optimal, stable operating temperatures. It also features a CNC-machined filler neck, an OEM-style brass petcock drain, and an integrated transmission fluid cooler to protect your drivetrain during heavy towing operations.

Technical Specifications

Compatibility

• Chevrolet Bel Air 5.7L (1971, 1972, 1973, 1974)
• Chevrolet Biscayne 5.7L (1971, 1972)
• Chevrolet Blazer 4.1L (1973, 1974)
• Chevrolet Blazer 4.8L (1973)
• Chevrolet Blazer 5.0L (1973)
• Chevrolet Blazer 5.7L (1973, 1974)
• Chevrolet Brookwood 5.7L (1971, 1972)
• Chevrolet C10 4.1L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C10 4.8L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C10 5.0L (1977, 1978, 1979, 1980)
• Chevrolet C10 5.7L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C10 Pickup 4.1L (1973, 1974)
• Chevrolet C10 Pickup 4.8L (1973, 1974)
• Chevrolet C10 Pickup 5.0L (1973)
• Chevrolet C10 Pickup 5.7L (1973, 1974)
• Chevrolet C10 Suburban 4.1L (1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C10 Suburban 4.8L (1973, 1974)
• Chevrolet C10 Suburban 5.0L (1973, 1977, 1978, 1979)
• Chevrolet C10 Suburban 5.7L (1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C20 4.1L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C20 4.8L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C20 5.0L (1977, 1978, 1979, 1980)
• Chevrolet C20 5.7L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C20 Pickup 4.1L (1973, 1974)
• Chevrolet C20 Pickup 4.8L (1973, 1974)
• Chevrolet C20 Pickup 5.0L (1973)
• Chevrolet C20 Pickup 5.7L (1973, 1974)
• Chevrolet C20 Suburban 4.1L (1973, 1974)
• Chevrolet C20 Suburban 4.8L (1973, 1974, 1975, 1976, 1977, 1978, 1979)
• Chevrolet C20 Suburban 5.0L (1973, 1977, 1978, 1979)
• Chevrolet C20 Suburban 5.7L (1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C30 4.1L (1975, 1978, 1979, 1980)
• Chevrolet C30 4.8L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C30 5.0L (1978, 1979)
• Chevrolet C30 5.7L (1975, 1976, 1977, 1978, 1979, 1980)
• Chevrolet C30 Pickup 4.1L (1973, 1974)
• Chevrolet C30 Pickup 4.8L (1973, 1974)
• Chevrolet C30 Pickup 5.0L (1973)
• Chevrolet C30 Pickup 5.7L (1973, 1974)
• Chevrolet Caprice 4.1L (1977, 1978, 1979)
• Chevrolet P30 4.8L (1975)

The GM Square Body Durability Standard

Built for the grueling demands of a heavy-duty workhorse chassis, this complete aluminum cooling package ensures your Square Body truck tows, hauls, and handles heavy summer traffic without breaking a sweat, protecting your vintage iron for decades to come.