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The Pontiac 455 engine is a powerhouse known for its torque and performance potential. If you’re looking to enhance your engine’s capabilities, swapping in a Crower Stage 4 cam can significantly improve your horsepower and overall driving experience. This article will guide you through the process of modifying your Pontiac 455 with a focus on the Crower Stage 4 cam swap.
Understanding the Pontiac 455 Engine
The Pontiac 455 cubic inch engine was produced between 1970 and 1976. It is revered for its robust design and ability to produce substantial torque. With the right modifications, it can be transformed into a formidable performance engine.
Benefits of Upgrading to a Crower Stage 4 Cam
The Crower Stage 4 cam is designed for high-performance applications, offering several advantages:
- Increased Horsepower: The cam profile allows for greater air and fuel flow, leading to higher power output.
- Improved Torque: Enhanced torque characteristics make acceleration more responsive.
- Better Engine Sound: A performance cam gives your engine a more aggressive sound, enhancing the driving experience.
Preparation for the Swap
Before diving into the cam swap, it’s crucial to prepare adequately. Here’s what you need:
- Tools Required: Wrenches, sockets, screwdrivers, torque wrench, camshaft installation tool.
- Parts Needed: Crower Stage 4 camshaft, new lifters, camshaft bearings, gasket set.
- Safety Gear: Gloves, goggles, and a clean workspace.
Step-by-Step Guide to Swapping the Cam
Step 1: Remove the Old Camshaft
Start by disconnecting the battery and draining the engine oil. Remove the intake manifold and valve covers to access the camshaft. Carefully take out the old camshaft and lifters.
Step 2: Install New Camshaft Bearings
Using a camshaft bearing installer, replace the old camshaft bearings with new ones. Ensure they are seated properly to avoid any issues with the new cam.
Step 3: Install the Crower Stage 4 Camshaft
Carefully position the Crower Stage 4 camshaft into the engine block. Make sure to align it correctly with the timing chain or gear. Use assembly lube on the cam and lifters to prevent wear during the initial startup.
Step 4: Reassemble the Engine
Once the camshaft is installed, reassemble the engine by replacing the lifters, valve covers, and intake manifold. Ensure all gaskets are new to prevent leaks.
Step 5: Adjust Valve Lash
With the engine reassembled, adjust the valve lash according to the specifications provided by Crower for the Stage 4 cam. This step is crucial for optimal performance.
Step 6: Final Checks and Startup
Double-check all connections, fluid levels, and ensure everything is tightened to specification. Reconnect the battery and start the engine. Allow it to idle and check for any unusual noises or leaks.
Tuning Your Pontiac 455
After swapping in the Crower Stage 4 cam, tuning your engine is essential for maximizing performance. Consider the following:
- ECU Tuning: Adjust the engine control unit settings to optimize fuel and timing maps.
- Dyno Testing: Use a dynamometer to measure power output and make further adjustments as needed.
- Fuel Quality: Use high-octane fuel to prevent knocking and ensure proper combustion.
Common Issues and Troubleshooting
During or after the cam swap, you may encounter some common issues:
- Engine Noise: If you hear excessive noise, check for proper installation of lifters and adjust valve lash.
- Oil Leaks: Inspect all gaskets and seals to ensure they are properly installed.
- Performance Issues: If the engine runs poorly, revisit tuning and ensure all components are functioning correctly.
Conclusion
Swapping in a Crower Stage 4 cam in your Pontiac 455 can yield significant performance improvements. By following the steps outlined above, you can enhance your engine’s power and enjoy a more thrilling driving experience. Remember to tune your engine appropriately and address any issues promptly to maintain optimal performance.