Modern Hemi V8 swaps in classic Mopars

Check out these classic mopars with modern hemi v8 swaps with #moparbro fred_eazy21
Swapping a modern Hemi V8 engine into a classic Mopar (Dodge, Plymouth, or Chrysler from the muscle car era) is a popular modification that blends the old-school charm of vintage vehicles with the power and reliability of modern engines. Here’s a comprehensive overview of the process, considerations, and benefits of undertaking such a swap:
Benefits of a Modern Hemi V8 Swap
Increased Power and Performance: Modern Hemi engines, such as the 5.7L, 6.1L, 6.4L, and supercharged 6.2L Hellcat, offer significantly more horsepower and torque compared to the original engines.
Reliability: Newer engines benefit from decades of engineering advancements, leading to better durability and fewer maintenance issues.
Fuel Efficiency: Modern engines typically offer better fuel economy due to improved fuel injection systems and advanced engine management.
Emissions Compliance: For those in regions with strict emissions regulations, modern engines can make it easier to comply with these laws.
Key Considerations
Engine Choice: Depending on your goals, budget, and vehicle, you'll need to choose the appropriate Hemi engine. Popular choices include:
5.7L Hemi: Widely available and offers a good balance of power and cost.
6.1L Hemi: Found in SRT models, offering more power.
6.4L Hemi: Even more power and torque, found in newer SRT and Scat Pack models.
6.2L Hellcat: Supercharged and offers extreme power, but requires more modification.
Engine Mounts and Fitment: Custom engine mounts are typically required to fit the modern Hemi into the classic Mopar. Kits are available from various aftermarket suppliers.
Transmission Compatibility: Modern Hemis are often paired with newer transmissions, such as the NAG1 (W5A580) automatic or the TR6060 manual. Adapter kits are available if you want to retain the original transmission.
Electronics and Wiring: One of the more complex parts of the swap involves integrating the modern engine’s electronics with the classic car. This includes the engine control unit (ECU), wiring harnesses, and sensors. Aftermarket standalone ECUs and wiring kits can simplify this process.
Cooling System: A modern Hemi engine will require an upgraded cooling system, including a high-capacity radiator and electric fans.
Exhaust System: Custom exhaust headers and piping will be needed to fit the modern engine within the classic car’s chassis.
Fuel System: Upgrading to an electric fuel pump and return-style fuel system is necessary to support the fuel injection system of the modern Hemi.
Driveline and Suspension: The increased power output may necessitate upgrades to the driveline (driveshaft, differential) and suspension to handle the additional power and torque.
Steps in the Swap Process
Planning and Research: Gather all necessary parts and information. Look for swap kits designed for your specific vehicle and engine combination.
Engine Removal: Remove the original engine, transmission, and associated components.
Mock-Up and Test Fitting: Install the new engine and transmission using the custom mounts and ensure proper fitment. Make any necessary adjustments.
Wiring and Electronics: Install the new wiring harness and connect all necessary sensors and the ECU. Test for proper operation.
Plumbing: Connect the cooling system, fuel lines, and exhaust system.
Final Assembly: Reinstall any remaining components, such as the driveline and suspension upgrades.
Testing and Tuning: Start the engine and perform initial checks. Fine-tune the ECU for optimal performance and driveability.
Popular Mopar Models for Hemi Swaps
Dodge Charger (1966-1974)
Dodge Challenger (1970-1974)
Plymouth Barracuda (1964-1974)
Plymouth Road Runner (1968-1980)
Dodge Dart (1960-1976)
Dodge Coronet (1965-1970)
Resources and Support
Numerous online forums, such as the Mopar Forum and Hemi Swap Forum, provide valuable information and community support for those undertaking a Hemi swap. Additionally, companies like Holley, Hedman, and Schumacher Creative Services offer specialized parts and kits to facilitate the swap.
By combining modern performance with classic styling, a Hemi V8 swap can transform a vintage Mopar into a high-powered, reliable machine that retains its nostalgic appeal while benefiting from modern technology.
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