Mopar 340 Performance Camshaft Upgrades: Increasing Power from 275 to 330 Hp

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The Mopar 340 engine has long been revered for its performance potential and is a favorite among muscle car enthusiasts. With a solid foundation producing around 275 horsepower, many owners seek to enhance their engine’s capabilities. One of the most effective ways to achieve this is through performance camshaft upgrades. In this article, we will explore the various camshaft options available for the Mopar 340 and how they can help increase power output to an impressive 330 horsepower.

Understanding the Mopar 340 Engine

The Mopar 340 was introduced in 1968 and quickly gained a reputation for its robust performance. It features a 4.04-inch bore and a 3.31-inch stroke, which allows for a displacement of 340 cubic inches. The engine was designed with a high-performance mindset, featuring a forged steel crankshaft, aluminum intake manifold, and a four-barrel carburetor. These components set the stage for significant power upgrades, particularly through camshaft modifications.

Why Upgrade the Camshaft?

Upgrading the camshaft is one of the most impactful modifications you can make to the Mopar 340 engine. The camshaft controls the timing and duration of the intake and exhaust valves, which directly affects engine performance. A performance camshaft can:

  • Increase horsepower and torque
  • Enhance throttle response
  • Improve engine efficiency
  • Modify the engine’s power band

Types of Performance Camshafts

When selecting a camshaft for the Mopar 340, there are several types to consider. Each type offers different characteristics that cater to various performance goals:

  • Hydraulic Flat Tappet Camshafts: These are the most common type and are ideal for street applications. They provide a good balance of performance and drivability.
  • Solid Flat Tappet Camshafts: These offer higher RPM potential and increased power but require more maintenance.
  • Hydraulic Roller Camshafts: Known for their efficiency and longevity, these camshafts provide excellent performance without sacrificing reliability.
  • Solid Roller Camshafts: The best choice for maximum performance, these camshafts are typically used in racing applications.

Choosing the Right Camshaft

Selecting the right camshaft for your Mopar 340 involves considering several factors:

  • Intended Use: Determine whether the vehicle will be used for daily driving, street performance, or racing.
  • Power Band: Choose a camshaft that matches your desired RPM range for optimal performance.
  • Compatibility: Ensure the camshaft is compatible with your existing engine components, including the intake, exhaust, and valvetrain.
  • Lift and Duration: Higher lift and longer duration typically yield more power but may affect drivability.

Here are some popular camshaft options for the Mopar 340 that can help you achieve that desired power increase:

  • Comp Cams Xtreme Energy 268H: This hydraulic flat tappet camshaft offers a great balance of performance and streetability, with an increase in horsepower and torque.
  • Howards Cams 110415-10: A solid flat tappet cam that provides excellent top-end power, making it suitable for performance applications.
  • Isky Racing Cams 201-S: This hydraulic roller camshaft is designed for high-performance builds, offering improved efficiency and power across the RPM range.
  • Lunati Voodoo 60103LK: A hydraulic flat tappet camshaft that enhances torque and power, ideal for street and strip use.

Installation Considerations

Installing a new camshaft in your Mopar 340 requires careful attention to detail. Here are some key considerations:

  • Tools Required: Ensure you have the necessary tools, including a torque wrench, camshaft installation tool, and engine assembly lube.
  • Timing Chain: Consider upgrading to a high-performance timing chain for improved accuracy and reliability.
  • Valve Springs: Upgrading valve springs is crucial to accommodate the increased lift and RPM associated with performance camshafts.
  • Clearance Checks: Always check for clearance issues between the camshaft and other engine components.

Tuning for Maximum Performance

After installing a new camshaft, tuning the engine is essential to maximize performance. This can include:

  • Adjusting Fuel Mixture: Proper air-fuel ratio is critical for optimal engine performance.
  • Ignition Timing: Adjusting ignition timing can help improve throttle response and power output.
  • Dyno Tuning: Consider using a dynamometer to fine-tune your engine for the best performance results.

Conclusion

Upgrading the camshaft in your Mopar 340 is a powerful way to enhance performance and increase horsepower from 275 to 330 HP. With a variety of camshaft options available, you can tailor your engine to meet your specific driving needs, whether for daily use or racing. Remember to consider installation requirements and tuning for optimal results. With the right camshaft upgrade, your Mopar 340 can deliver the exhilarating performance you desire.