.4 Hemi Cam Swap: a Step-by-step Guide to Achieving 50+ Rwhp Gains

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The .4 HEMI cam swap is a popular modification among performance enthusiasts looking to boost their vehicle’s horsepower. By upgrading the camshaft, you can achieve significant gains in rear-wheel horsepower (RWHP), often exceeding 50 RWHP. This guide provides a step-by-step approach to successfully completing a .4 HEMI cam swap.

Understanding the Benefits of a Cam Swap

Before diving into the swap, it’s essential to understand why a cam swap can be beneficial:

  • Increased Power: A performance camshaft can significantly enhance engine performance.
  • Improved Throttle Response: Upgrading the cam can lead to better throttle response and acceleration.
  • Enhanced Sound: A new cam can give your engine a more aggressive sound.

Tools and Materials Needed

Gathering the right tools and materials is crucial for a successful cam swap. Here’s what you will need:

  • Tools:
    • Socket set
    • Torque wrench
    • Engine hoist (if necessary)
    • Timing tools
    • Oil filter wrench
    • Gasket scraper
  • Materials:
    • New camshaft
    • Camshaft timing chain or belt
    • New gaskets
    • Engine oil
    • Coolant

Preparation for the Cam Swap

Proper preparation can save time and ensure a smoother process. Follow these steps:

  • Disconnect the Battery: Always disconnect the negative terminal to prevent electrical issues.
  • Drain Engine Oil: Remove the oil drain plug and let the oil drain completely.
  • Remove the Intake Manifold: Carefully detach the intake manifold to access the camshaft.

Step-by-Step Cam Swap Process

1. Remove the Old Camshaft

To remove the old camshaft, follow these steps:

  • Remove the timing cover and timing chain or belt.
  • Unbolt the camshaft from the engine block.
  • Carefully slide the old camshaft out of the engine.

2. Install the New Camshaft

Installing the new camshaft requires precision:

  • Apply assembly lube to the new camshaft.
  • Carefully insert the new camshaft into the engine.
  • Secure the camshaft with bolts and torque them to specifications.

3. Reassemble the Engine

After the new camshaft is installed, reassemble the engine:

  • Reinstall the timing chain or belt.
  • Replace the timing cover.
  • Reattach the intake manifold.
  • Reconnect the battery.

Post-Swap Considerations

After completing the cam swap, consider the following:

  • Oil Change: Change the engine oil to ensure optimal performance.
  • Check for Leaks: Inspect for any oil or coolant leaks around the gaskets.
  • ECU Tuning: Consider tuning the ECU to maximize the benefits of the new camshaft.

Conclusion

The .4 HEMI cam swap is a rewarding project that can yield impressive power gains. By following this step-by-step guide, you can successfully upgrade your camshaft and enjoy the enhanced performance of your vehicle. Always remember to take your time and ensure every step is completed correctly for the best results.