Upgrading the camshaft in a 6.4 HEMI engine is one of the most effective bolt-on modifications for unlocking substantial power gains. While the stock camshaft is designed for a broad torque curve and reliability, a performance cam like the Mopar Performance 6.4 HEMI camshaft targets higher rpm, increased valve lift, and greater duration for noticeable horsepower and torque improvements. However, this upgrade involves more than just swapping the cam. Understanding the full cost breakdown—including parts, labor, supporting components, and tuning—helps you budget accurately and avoid surprises. In this guide, we break down every expense associated with installing a Mopar Performance cam upgrade on your 6.4 HEMI, from the cam itself to the final dyno tune.

Understanding the 6.4 HEMI Cam Upgrade from Mopar Performance

The Mopar Performance camshaft for the 6.4 HEMI (also known as the 392 HEMI) is a drop-in upgrade designed for natural aspiration, though it can also serve as a foundation for forced induction setups. It features increased lift and duration compared to the factory cam, which improves airflow into the cylinders and results in a more aggressive idle and higher peak power. Mopar Performance offers two main variants: a Stage 1 cam (mild profile, good for daily drivers) and a Stage 2 cam (more aggressive, requiring upgraded valve springs and pushrods). The Stage 2 is the focus of most performance enthusiasts.

Why choose Mopar Performance over aftermarket brands like Comp Cams or Texas Speed? Mopar cams are specifically engineered for the 6.4 HEMI's valvetrain geometry, ensuring compatibility with the factory variable valve timing (VVT) system and allowing you to retain MDS (Multi-Displacement System) if desired. This factory-backed engineering minimizes risk of piston-to-valve interference and simplifies installation, making it a popular choice for DIYers and shops alike. However, the cost is higher than many aftermarket options, as we'll detail below.

Detailed Cost Breakdown

The total investment for a 6.4 HEMI cam upgrade extends well beyond the camshaft itself. Supporting components, labor, tuning, and incidentals all contribute to the final number. Below is an itemized cost breakdown for a typical Stage 2 Mopar Performance cam installation on a third-generation Hemi (including Dodge Charger SRT, Challenger Scat Pack, and Jeep Grand Cherokee SRT models).

1. Parts Costs

The core parts list includes the camshaft and necessary valvetrain upgrades. Prices are based on current retail from Mopar Performance and reputable suppliers. Note that you may find discounts through online Mopar parts dealers or during holiday sales.

  • Mopar Performance Stage 2 Camshaft (P5153990AB or equivalent): $1,200 – $1,400 (depending on supplier and any current rebates)
  • Mopar Performance Valve Springs & Retainers Kit: $250 – $350 (required for Stage 2 cam to prevent coil bind)
  • Mopar Performance Pushrods (length to match cam base circle): $100 – $150 (often sold in sets of 16)
  • Timing Chain Set (including tensioner, guides, and dampers): $200 – $300 (new chain recommended at 30k miles or more)
  • Camshaft Bearings (main and cam bearings): $80 – $120 (if replacing, though many reuse if in good condition)
  • Gasket & Seal Kit (valley cover, front cover, oil pan gasket, timing cover, cam seal): $150 – $200 (use OEM or high-quality aftermarket)
  • Oil and Filter (5W-30 or 0W-40, 7 quarts): $60 – $80
  • Coolant (for any cooling system drain during cam swap): $25 – $40
  • Fuel Pump (optional but recommended for high-rpm operation; AEM or DW): $150 – $250 (if upgrading)
  • Miscellaneous supplies (loctite, RTV, thread sealer, rags, degreaser): $50

Total Parts Cost: Approximately $2,265 – $2,940 (without fuel pump) or up to $3,190 with fuel pump. This is higher than the original article's estimate of $1,700 because we include valve springs, pushrods, and timing chain—components essential for reliability with a Stage 2 cam.

2. Labor Costs

Labor rates vary widely by geographic location and shop expertise. A typical shop in the U.S. charges between $100 and $150 per hour. The cam swap on a 6.4 HEMI is not a simple job; it requires removal of the front engine dress (radiator, fans, accessories), timing chain, valve covers, and often the cylinder heads. Expert technicians can complete the mechanical swap in 8–10 hours, but additional time is needed for tuning and testing.

  • Mechanical labor (cam, springs, pushrods, timing chain): 10–12 hours
  • Labor rate: $100 – $150/hr

Total Mechanical Labor: $1,000 – $1,800

If you opt to have the shop also install the fuel pump (if needed), add 2–3 hours. Many shops also include a short break-in procedure (idle time, oil change) as part of the labor, but some charge extra.

DIY Labor: If you perform the job yourself, you save the entire labor cost but must invest in specialized tools (cam gear puller, timing chain lock, dial indicator, micrometer) which can run $200–$400. The time commitment is easily 15–20 hours for a first-timer. Weigh this against the $1,000–$1,800 savings.

3. Tuning Costs

A cam swap on a modern HEMI with VVT and MDS requires custom tuning to achieve the full power gains and avoid drivability issues. The engine management system must be recalibrated for the new cam timing, airflow, and fuel tables. Many experienced shops include a baseline dyno pull and a final tune in their labor quote, but often it's separate.

  • Custom dyno tune (including licensing for HP Tuners or DiabloSport): $400 – $700
  • Remote tuning (send logs, receive calibrated file): $300 – $500

Total Tuning Cost: $400 – $700

4. Additional Expenses

Even after the cam is installed and tuned, there may be other costs to factor in. These are less predictable but common among high-performance builds.

  • Diagnostic fees (pre-install compression test, leak-down test): $100 – $200
  • Oil and filter change after 500-mile break-in: $60 – $80
  • New spark plugs (if plugs are original >50k miles): $80 – $120
  • Miscellaneous shop supplies (shop towels, brake cleaner, etc.): $50 – $100

Total Additional Expenses: $290 – $500

Total Cost Estimate Summary

Combining all the above categories gives a realistic total range for installing a Mopar Performance 6.4 HEMI cam upgrade, assuming professional installation and a proper tune.

  • Parts (with valve springs, pushrods, timing chain): $2,265 – $2,940
  • Labor (mechanical): $1,000 – $1,800
  • Tuning: $400 – $700
  • Additional expenses (diagnostics, break-in oil, plugs): $290 – $500

Total Estimated Cost: $3,955 – $5,940

This is significantly higher than the original article's $2,850 estimate, because the Mopar Stage 2 cam requires upgraded springs and pushrods, and a proper tune is essential for drivability and performance. You can lower costs by sourcing parts during sales, doing the install yourself, or using a milder Stage 1 cam that can reuse stock springs (though still recommended to upgrade).

Factors That Affect the Final Bill

Several variables can swing the total cost by hundreds of dollars. Understanding these helps you negotiate with shops or plan your budget.

Geographic Location and Shop Reputation

Performance shops in major metropolitan areas (Los Angeles, New York, Dallas) command higher labor rates (up to $175/hr) than shops in smaller towns. Additionally, shops with known HEMI experience may charge a premium but can often finish the job faster and with fewer issues.

Whether You Retain VVT and MDS

Mopar Performance cams are designed to work with VVT, but many enthusiasts choose to delete VVT and MDS for simplicity and weight reduction. Deleting requires a different cam gear (locking phaser eliminator kit, ~$250) and a custom tune that disables VVT. This adds cost but can simplify the install and improve consistency.

Choice of Supporting Parts

You can opt for cheaper aftermarket valve springs (e.g., BTR or PAC) instead of Mopar-branded ones, saving $50–$100. However, Mopar springs are paired specifically to their cam profile for optimal durability. Similarly, using a stock timing chain if it's low mileage may save $200, but replacing it is highly recommended to prevent failure at higher rpm.

DIY vs. Professional Installation

If you have mechanical skills and a well-equipped garage, you can save $1,000–$1,800 in labor. But you must account for the learning curve, potential need for specialized tools, and risk of engine damage if mistakes occur. Budget an extra $200–$400 for tools you don't already own.

Performance Gains and Return on Investment

With the Mopar Performance Stage 2 cam installed and properly tuned, you can expect 40–60 horsepower and 30–50 lb-ft of torque at the wheels on a naturally aspirated 6.4 HEMI. Combined with a cold air intake and full exhaust system, gains can exceed 70 horsepower. The engine's powerband shifts upward, with peak power arriving around 6,200–6,500 rpm compared to the stock 5,800 rpm.

Is the cost worth it? Many owners report that the improvement in throttle response and the aggressive idle are worth the $4,000–$6,000 investment. For context, a supercharger kit (such as a Whipple or ProCharger) can cost $7,000–$10,000 installed and tuned, making a cam swap a more affordable path to significant power. However, a cam upgrade alone will not match the peak power of forced induction; it's a naturally aspirated optimization.

Common Pitfalls and Considerations

Before writing a check, be aware of a few common issues that can add unexpected costs.

  • Valve Spring Failure: Aftermarket springs can break if not installed correctly or if the cam's lift exceeds the spring's max lift. Always verify spring specs and use a spring pressure checker.
  • Piston-to-Valve Clearance: The 6.4 HEMI has limited piston-to-valve clearance with high-lift cams. Mopar Performance cams are designed to be safe, but if you mill the heads or use thinner head gaskets, you may need to fly-cut pistons (adds $400–$800).
  • Oil Consumption: Some Stage 2 cams increase oil consumption due to higher valve lift and duration. Plan on checking oil level more frequently and using a quality 5W-40 oil.
  • Idle Quality: An aggressive cam will have a noticeable lope at idle. If you daily-drive the car, be prepared for a rougher idle and potential stalling if tuning isn't dialed in.

Conclusion

Installing a Mopar Performance camshaft in your 6.4 HEMI is a rewarding upgrade that can unlock the engine's true potential. While the total cost—typically between $4,000 and $6,000 for a Stage 2 setup—is significantly higher than a basic parts-only estimate, it covers all essential components: cam, valve springs, pushrods, timing chain, professional labor, and custom tuning. For enthusiasts seeking a dramatic improvement in power and driving character, this investment delivers a strong return in both performance and satisfaction. Always choose reputable parts and a shop experienced with HEMI engines to ensure reliability and peak results.

For more information on Mopar Performance products, visit the official Mopar website. For community feedback and installation guides, Hemi Garage forums are an excellent resource. If you decide to purchase parts online, Texas Speed & Performance offers competitive pricing on HEMI cam packages. For tuning solutions, HP Tuners provides VCM Suite for supported vehicles.