Can You Put a 5.7 Hemi in a 4.7 Truck?

Lillian Nelson

When it comes to engine swaps, enthusiasts and truck owners often find themselves pondering the possibilities. One common question that arises is whether it’s feasible to replace the stock engine in a 4.7-liter truck with a more powerful 5.7-liter Hemi engine. Let’s dive into the details and explore the pros, cons, and technical considerations of such a swap.

1. Understanding the Engines

Before we delve into the compatibility of these engines, let’s briefly understand their specifications:

  • 4.7-Liter V8: The 4.7-liter V8 engine is commonly found in Dodge Ram trucks and some Jeep models. It produces around 235 horsepower and 295 lb-ft of torque. While it’s a reliable workhorse, some truck owners crave more power.
  • 5.7-Liter Hemi V8: The legendary 5.7-liter Hemi V8 engine is synonymous with muscle cars and trucks. It generates approximately 395 horsepower and 410 lb-ft of torque. Its aggressive sound and performance make it a favorite among gearheads.

2. Compatibility

The million-dollar question: Can you put a 5.7 Hemi in a 4.7 truck? The short answer is yes, but it’s not a straightforward process. Here are the key points to consider:

  • Mounting and Fitment: The physical dimensions of the 5.7 Hemi engine are different from the 4.7-liter V8. You’ll need custom motor mounts and possibly modifications to the engine bay to ensure a proper fit.
  • Wiring and Electronics: The 5.7 Hemi runs on a different engine management system. Adapting the wiring harness, sensors, and ECU (engine control unit) is crucial. Some aftermarket companies offer conversion kits to simplify this process.
  • Transmission Compatibility: The 4.7 and 5.7 engines may have different bolt patterns for the transmission. You’ll need to verify if your existing transmission can handle the increased power and torque.
  • Exhaust System: The 5.7 Hemi requires a different exhaust setup. Custom headers, pipes, and mufflers will be necessary to accommodate the larger engine.
  • Cooling System: The Hemi generates more heat, so upgrading the radiator, fans, and coolant system is essential.

3. Performance Gains

Now, let’s talk about the exciting part: performance gains. Swapping the 4.7-liter for the 5.7 Hemi can transform your truck’s driving experience:

  • Power Boost: With nearly double the horsepower, the Hemi provides exhilarating acceleration. Towing capacity and payload also increase significantly.
  • Soundtrack: The Hemi’s deep rumble is music to any gearhead’s ears. It turns heads and announces your presence.
  • Resale Value: A well-executed Hemi swap can enhance your truck’s resale value, especially if done professionally.

4. Cost and Labor

Let’s be real: engine swaps aren’t cheap. The cost includes the engine itself, labor charges, custom parts, and unforeseen expenses. If you’re a skilled DIYer, you can save money by doing some of the work yourself. However, professional installation ensures reliability.

5. Legal Considerations

Before embarking on this project, check local emissions laws and regulations. Some states require emissions testing, and swapping engines might affect your vehicle’s compliance.

6. Conclusion

Putting a 5.7 Hemi in a 4.7 truck is an ambitious undertaking. It requires technical expertise, patience, and a love for tinkering. If you’re up for the challenge, the reward is a beastly truck that combines reliability with raw power.

Remember, consult with experts, weigh the costs, and enjoy the journey of turning your ordinary truck into something extraordinary!

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