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The Mopar 340 engine has long been celebrated among automotive enthusiasts for its performance and potential. Upgrading to a Mopar 340 with Stage II headwork can significantly enhance power output and overall engine efficiency. In this article, we will explore the benefits of such an upgrade, the associated costs, and what to expect during installation.
Understanding the Mopar 340 Engine
The Mopar 340 was introduced in 1968 as a high-performance small-block engine. It quickly gained a reputation for its impressive power-to-weight ratio and responsiveness. The engine features a 4.04-inch bore and a 3.31-inch stroke, with a factory rating of 275 horsepower.
Benefits of Upgrading to Stage II Headwork
Stage II headwork involves modifications to the cylinder heads that enhance airflow, combustion efficiency, and overall performance. Here are some key benefits:
- Increased Horsepower: Stage II headwork can boost horsepower significantly, often adding 30-50 horsepower depending on other modifications.
- Improved Torque: Enhancements in airflow can lead to better torque delivery across the RPM range.
- Better Throttle Response: Enhanced headwork results in quicker throttle response, making the vehicle more enjoyable to drive.
- Optimized Fuel Efficiency: Improved combustion efficiency can lead to better fuel economy under certain driving conditions.
Installation Costs
The cost of upgrading to a Mopar 340 with Stage II headwork can vary widely based on several factors, including labor, parts, and additional modifications. Below is a breakdown of potential costs:
- Stage II Headwork: $1,500 – $3,000 depending on the shop and specific modifications.
- Labor Costs: $500 – $1,500 for installation, depending on the complexity of the work.
- Additional Parts: $200 – $1,000 for gaskets, fluids, and any necessary upgrades (e.g., intake manifold, carburetor).
- Dyno Tuning: $300 – $600 to optimize performance after installation.
Installation Process
The installation of Stage II headwork on a Mopar 340 involves several steps. Here’s a general overview of the process:
- Preparation: Disconnect the battery and remove any components obstructing access to the cylinder heads.
- Removal of Old Heads: Carefully remove the existing cylinder heads, taking care to label parts for reassembly.
- Head Modification: Send the heads to a machine shop for porting, polishing, and any additional enhancements.
- Reinstallation: Once modified, reinstall the heads with new gaskets and torque them to specifications.
- Final Checks: Reconnect all components, check fluid levels, and prepare for dyno tuning.
Power Gains from Upgrading
After completing the installation, many enthusiasts report substantial power gains. Depending on the specific modifications and tuning, it is common to see:
- Horsepower Increases: Gains of 30-50 horsepower are typical with Stage II headwork.
- Torque Improvements: Increased torque can enhance acceleration and drivability.
- Performance Testing: Utilizing a dynamometer can help quantify the improvements and fine-tune the engine settings.
Conclusion
Upgrading to a Mopar 340 with Stage II headwork can be a rewarding investment for those seeking enhanced performance. While the installation costs can vary, the benefits in horsepower, torque, and overall driving experience make it a popular choice among automotive enthusiasts. Whether you’re a seasoned mechanic or a novice, understanding the process and potential gains can help you make informed decisions about your engine upgrades.