Aluminum Raditor 77-87 GM P/U LS Engine

The Cold Case Radiators Aluminum Radiator for 1977–1987 GM Pickup Trucks with LS Engine Swap (GMT556A21LSK) is a high-capacity cooling solution purpose-built for classic truck restorations and LS engine conversions. This all-aluminum radiator delivers efficient heat dissipation in a polished finish, combining modern cooling technology with the clean aesthetic demanded by serious build projects. The unit measures 34.33 inches wide by 21 inches tall with a 6.75-inch core depth, engineered to fit the factory GM fullsize truck mounting points while accommodating contemporary LS-series powerplants that generate significantly more heat than original carbureted mills.

Specifications confirm a passenger-side inlet and outlet configuration designed for straightforward plumbing integration. The kit includes dual 12-inch fans, critical for low-speed cooling during slow cruises or static engine runs where air velocity through the core is minimal. All-aluminum construction eliminates corrosion concerns inherent to older brass-and-copper designs, a substantial advantage when resurrecting vehicles destined for outdoor use or extended storage. The polished finish coordinates with custom engine bays and meets the visual standards expected in show-quality restorations. Compatible with automatic transmissions, the radiator supports the electrical cooling demands of modern LS conversions without auxiliary cooling circuits.

This radiator is the go-to choice for LS swap builds in square-body trucks, whether you're upgrading a 1977–1987 C10, K10, or similar full-size platform. Hobbyists and professional builders select Cold Case Radiators for their engineering accuracy and fit—no cutting, adapting, or fabrication required when matched with the correct core and fan combination. At 48 pounds, the assembly adds manageable weight while providing the cooling capacity necessary for sustained highway cruising and daily-driver reliability. Anyone undertaking an LS conversion on a classic GM truck will find this radiator eliminates one of the most critical unknowns: whether the cooling system will keep cylinder head temperatures in the safe zone under real-world driving conditions.