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The Mopar 426 HEMI engine has long been revered in the automotive world, particularly among muscle car enthusiasts. Upgrading to factory Mopar 426 HEMI heads can significantly enhance the performance of B-body Mopars. In this article, we will delve into the power gains, cost implications, and considerations for those looking to make this upgrade.
Understanding the Mopar 426 HEMI Heads
The 426 HEMI heads are known for their unique design, featuring hemispherical combustion chambers that allow for better airflow and higher compression ratios. This design contributes to the engine’s ability to produce more horsepower and torque compared to standard heads.
Key Features of 426 HEMI Heads
- Hemispherical combustion chambers for improved airflow
- High-performance valve train components
- Enhanced cooling capabilities
- Compatibility with various B-body models
Power Gains from Upgrading
One of the most compelling reasons to upgrade to factory Mopar 426 HEMI heads is the significant power increase. Depending on the existing engine setup and tuning, enthusiasts can expect considerable gains in horsepower and torque.
Estimated Power Increases
- Stock 383 or 440 engines can see increases of 50-100 horsepower.
- Improved torque delivery throughout the RPM range.
- Better throttle response and acceleration.
Cost Analysis of Upgrading
While the power gains are enticing, potential buyers must consider the costs associated with upgrading to factory Mopar 426 HEMI heads. The financial investment can vary based on several factors, including the condition of the heads and any additional modifications required.
Initial Costs
- Factory Mopar 426 HEMI heads typically range from $2,500 to $5,000, depending on condition.
- New valve train components may add another $1,000 to $2,500.
- Machining and installation costs can range from $500 to $1,500.
Long-term Value
Investing in 426 HEMI heads can also enhance the overall value of a B-body Mopar. These upgrades are often sought after by collectors and enthusiasts, making them a worthwhile investment in the long run.
Considerations Before Upgrading
Before committing to an upgrade, it is essential to consider several factors that may affect the outcome of your project.
Engine Compatibility
Ensure that your existing engine can accommodate the 426 HEMI heads. Some modifications may be required to the intake manifold, exhaust system, and other components.
Tuning and Fuel Requirements
Upgrading to 426 HEMI heads may necessitate changes to your engine tuning. Additionally, higher compression ratios may require premium fuel to prevent knocking and ensure optimal performance.
Conclusion
Upgrading to factory Mopar 426 HEMI heads is an exciting prospect for B-body Mopar owners looking to enhance their vehicle’s performance. With significant power gains and the potential for increased value, this upgrade can be a worthy investment. However, careful consideration of costs, compatibility, and tuning requirements is essential for a successful upgrade.