Step-by-step 5.7 Hemi Cam Swap: Building a 400-hp Street Beast

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Building a 400-hp street beast with a 5.7 HEMI engine is an exciting project for automotive enthusiasts. One of the most effective modifications you can make to achieve this goal is swapping the camshaft. This guide will walk you through the step-by-step process of performing a cam swap on your 5.7 HEMI engine.

Understanding the 5.7 HEMI Engine

The 5.7 HEMI engine, known for its unique hemispherical combustion chamber design, offers a great balance of performance and efficiency. Before diving into the cam swap, it’s important to understand the basic components and how they interact.

  • Hemispherical Combustion Chamber
  • Variable Valve Timing (VVT)
  • High-Performance Aftermarket Parts

Tools and Materials Needed

Before starting the cam swap, gather all necessary tools and materials to ensure a smooth process. Here’s a list of what you’ll need:

  • Socket set
  • Torque wrench
  • Camshaft (aftermarket performance cam)
  • Gasket set
  • Engine oil
  • Lubricant for camshaft installation
  • Timing chain or belt (if necessary)
  • Basic hand tools (screwdrivers, pliers, etc.)

Step 1: Preparation

Start by preparing your workspace. Make sure you have a clean, well-lit area to work in. Disconnect the battery and remove any components that obstruct access to the camshaft.

Disconnecting Components

Remove the following components:

  • Intake manifold
  • Valve covers
  • Exhaust headers
  • Any sensors or wiring harnesses

Step 2: Removing the Old Camshaft

Once you have access to the camshaft, it’s time to remove it. Follow these steps carefully:

  • Remove the timing cover if necessary.
  • Mark the position of the timing chain or belt.
  • Remove the timing chain or belt.
  • Unbolt the camshaft from the engine block.
  • Carefully slide the old camshaft out of the engine.

Step 3: Installing the New Camshaft

With the old camshaft removed, it’s time to install the new one. Follow these steps:

  • Apply lubricant to the new camshaft.
  • Align the camshaft with the timing marks.
  • Carefully slide the new camshaft into place.
  • Secure the camshaft with bolts, following the manufacturer’s torque specifications.

Step 4: Reassembly

After the new camshaft is installed, it’s time to reassemble the engine. This step is crucial for ensuring everything functions correctly.

  • Reinstall the timing chain or belt, ensuring proper alignment.
  • Replace the timing cover.
  • Reattach the valve covers.
  • Reconnect the intake manifold and any other components removed.

Step 5: Final Checks and Testing

Before starting the engine, perform a series of final checks:

  • Ensure all bolts are tightened to specifications.
  • Double-check that all components are reconnected.
  • Fill the engine with fresh oil.

Step 6: Starting the Engine

Now it’s time to start the engine. Follow these guidelines:

  • Reconnect the battery.
  • Turn the ignition key and listen for any unusual sounds.
  • Allow the engine to idle and check for leaks.

Step 7: Tuning the Engine

After the cam swap, tuning the engine is essential to maximize performance. Consider the following:

  • Use an aftermarket tuner or ECU reflash.
  • Adjust fuel maps for optimal performance.
  • Monitor air-fuel ratios during tuning.

Conclusion

Swapping the camshaft in your 5.7 HEMI engine can significantly enhance performance, allowing you to build a powerful street beast. By following this step-by-step guide, you can ensure a successful cam swap and enjoy the benefits of increased horsepower and torque.