1970-1981 Pontiac Firebird LS Radiator for Automatic Transmission
Swapping an LS engine into a 1970-1981 F Body Firebird with an automatic transmission places heavy demands on the stock cooling system. This 1970-1981 Firebird Radiator (AutoTrans) solves that by using a TIG welded aluminum core and tanks for consistent heat rejection under spirited driving or long highway runs. It slips into all original mounting locations without modification and includes complete hardware for a true bolt-in fit. Precision coolant passages and a dense fin layout maintain stable temperatures and resist corrosion over years of service.
Precision TIG Welded Aluminum for Rigidity and Weight Savings
The radiator employs fully TIG welded aluminum tanks and core to create seamless joints that resist leaks under continuous thermal cycling. TIG welding delivers uniform bead profiles and minimal heat distortion, preserving the precise coolant paths essential for an LS engine swap in a classic F Body. High quality aluminum keeps the assembly light, improving throttle response and avoiding added strain on factory mounts. Relying on a monolithic aluminum structure also enhances vibration tolerance, ensuring the radiator holds its shape over rough road surfaces. Each weld is inspected to maintain pressure integrity, reducing the risk of field repairs. The result is a durable core that stands up to spirited driving and years of service without failure.
Efficient Cooling through Optimized Fin and Tube Layout
A dense arrangement of aluminum fins and coolant tubes maximizes surface area for rapid heat transfer from liquid to air. Core thickness and fin density strike a balance between cooling capacity and underhood airflow, allowing the stock fan to operate effectively without extra parasitic drag. Precisely sized coolant passages maintain uniform flow rates, preventing hotspots around cylinder heads and block exits during sustained high load. This engineered configuration ensures stable engine temperatures, whether cruising on the highway or tackling winding back roads. By tuning fin spacing to match cooling demand, the radiator quickly absorbs heat spikes from a modern LS powerplant. Drivers benefit from consistent thermal control that protects both performance and engine longevity.
Corrosion Resistance with Bare Aluminum and Epoxy Coating Options
Aluminum naturally forms a protective oxide layer that defends against pitting in humid or corrosive environments. For enhanced protection, an optional black epoxy finish is applied in controlled conditions, offering a hard barrier to road chemicals and debris. The classic bare aluminum look remains a low maintenance choice, as the self healing oxide film restores itself after minor surface scratches. Both finish options are factory applied to ensure uniform coverage and simplify cleanup in garage or track settings. Corrosion resistance extends the radiator's service life, reducing the likelihood of leaks or structural weakness over time. Owners can choose the finish that best suits their aesthetic preference and environmental exposure.
Factory Fitted Bolt in Installation for 1970 to 1981 F Body
This radiator is engineered to mount directly into 1970 to 1981 Pontiac Firebird frames equipped with automatic transmissions, using all original mounting points. Hose connections and bracket positions match factory dimensions, eliminating the need for custom adapters or drilling. A complete hardware kit is included to guide installers through each step with clear instructions, making the swap accessible to home mechanics and professional shops alike. By preserving stock chassis geometry, coolant lines align precisely and the radiator sits firmly without stress on brackets. The direct fit design cuts installation time and reduces potential alignment issues. Once installed, the system integrates seamlessly with the factory fan shroud and overflow reservoir for a finished look.
Trust in MuscleRods precision engineering for consistent cooling and a direct fit. For the same radiator but with fans see our 1970-1981 Firebird Radiator (Automatic Transmission) with Fans.