Harley Twin Cam Performance Kit Upgrades: How to Get the Most Power Out of Your Engine

If you're riding a Harley-Davidson Twin Cam and looking for more horsepower, stronger torque, and improved engine reliability, you don't necessarily need to spend thousands of dollars building an entirely new motor. Sometimes, the right combination of performance upgrades can completely transform how your motorcycle rides.

At Mickey Cohen Motorsports, we've spent years working with Harley-Davidson engines, developing performance combinations that deliver real-world results. Our Harley Twin Cam Performance Kit upgrades are designed for riders who want noticeable power gains without sacrificing the reliability and ride-ability of their motorcycles.

Whether you're riding a Harley-Davidson Dyna, Softail, Touring model, or Trike, choosing the right camshaft, oil pump, and supporting components can make a significant difference in how your engine performs.

Here's everything you need to know about getting the most out of your Harley-Davidson Twin Cam.

Why Upgrade Your Harley-Davidson Twin Cam Engine?

The Harley-Davidson Twin Cam engine has earned a reputation for delivering dependable V-twin performance. However, like any factory engine, there's plenty of room for improvement.

Stock Twin Cam engines can benefit from upgrades that address power delivery, oil pressure, and aging components. For riders with 20,000 to 30,000 miles on their motorcycles, it may also be a good time to inspect components such as lifters, cam chain tensioners, cam chains & sprockets.

According to Mickey Cohen, owner of Mickey Cohen Motorsports, these upgrades don't have to be complicated.

His approach focuses on building engines that deliver more usable power while maintaining the reliability riders expect from their motorcycles.

Rather than chasing the highest possible horsepower number, Mickey prefers performance combinations that provide immediate throttle response, strong low-end torque, and dependable everyday performance.

That's exactly what our Twin Cam Performance Kits are designed to accomplish.

What's Included in a Harley Twin Cam Performance Kit?

One of the biggest advantages of purchasing a complete twin cam performance kit is getting a combination of components designed to work together.

At Mickey Cohen Motorsports, our Twin Cam Performance Kits include several essential upgrades that address both engine performance and reliability.

Key components include:

• Performance Camshafts: Designed to improve horsepower, torque, and overall engine response.
• Adjustable Pushrods: Support proper valvetrain setup during camshaft installation.
• Cam Chain Tensioners: Replace aging components and support dependable cam drive operation.
• New Lifters: Help maintain proper valvetrain operation and reliability.
• Upgraded Oil Pump: Provides improved oil pressure and lubrication performance.
• Cam Plate: Works with the upgraded oil pump to improve oil system performance.

Mickey considers the upgraded oil pump and cam plate among the most important improvements you can make to a Twin Cam engine.

These components help address limitations in the factory oiling system while supporting more consistent engine operation.

Combined with the right camshaft, they create a well-rounded performance package that's ideal for street riding.

For those 2007-2017 bt Twin Cam owners who want to take it a step further, Mickey also recommends replacing your cam chains & sprockets.

How Much Horsepower Can a Twin Cam Performance Kit Add?

One of the most common questions we hear is simple: How much more power will my Harley make?

The answer depends on your engine, exhaust system, tuning, and supporting modifications.

However, Mickey Cohen has seen impressive results from properly installed Twin Cam Performance Kits.

For example, a typical Harley-Davidson 103 Twin Cam engine producing approximately 77–78 horsepower in stock form may reach around 89–95 horsepower with the appropriate upgrades.

Torque can also increase significantly.

According to Mickey, some 103 Twin Cam engines that originally produced approximately 88 lb-ft of torque have increased to around 100–110 lb-ft after installing these performance combinations.

That's a substantial improvement for a motorcycle that's still designed to be ridden comfortably on the street.

Depending on the motorcycle and its original configuration, riders may experience power gains in the 20–30% range.

These figures are examples from Mickey's experience, not guaranteed results. Actual gains vary based on engine condition, supporting components, installation, and tuning.

Choosing the Right Camshaft for '07-17 Twin Cams and '06 Twin Cam Dynas: 223-6 vs. 556

Selecting the right camshaft is one of the most important decisions you'll make when upgrading your Harley-Davidson Twin Cam.

At Mickey Cohen Motorsports, two popular options are the 223-6 and 556 camshaft configurations.

Although both offer performance improvements, they're designed for different riding styles.

223-6 Camshaft: Maximum Low-End Torque and Street Performance

For riders who want stronger acceleration, immediate throttle response, and plenty of pulling power, Mickey typically recommends the Wood Performance Mickey Cohen Signature Cam - MC-223-6.

This camshaft configuration focuses on producing usable torque at lower engine speeds, making it an excellent choice for everyday street riding.

It's particularly well-suited for heavier Harley-Davidson motorcycles, including Touring models, baggers, and Trikes.

Riders who frequently travel with passengers, carry luggage, or pull trailers can benefit from the additional low-end torque.

Mickey also favors this style of camshaft for many 110 Twin Cam engines, particularly when the motorcycle is used primarily for cruising and touring.

Instead of needing to rev the engine aggressively, the Wood Performance Mickey Cohen Signature Cam - MC-223-6 delivers power where most street riders actually use it.

556 Camshaft: Higher-RPM Performance

If your riding style is more aggressive, the Wood Performance Mickey Cohen Signature Cam - MC-556 may be the better choice.

Mickey recommends this option for riders who enjoy higher engine speeds and want a more performance-oriented powerband.

The 556 is particularly appealing to riders who regularly push their motorcycles harder, including performance-focused Dyna and Softail owners.

It's also an option for certain 103 and 110 Twin Cam builds.

While the 223-6 prioritizes low-end pulling power, the 556 is better suited to riders who want stronger performance higher in the RPM range.

According to Mickey, the best camshaft isn't necessarily the one that produces the biggest peak horsepower number. It's the one that matches how you actually ride.

Why an Upgraded Oil Pump and Cam Plate Matter

When discussing Performance Harley Davidson parts, camshafts often receive the most attention.

However, Mickey believes that upgrading the oil pump and cam plate is one of the most valuable improvements you can make to a Twin Cam engine.

Factory Twin Cam oiling systems can experience relatively low oil pressure when the engine is hot.

Mickey has observed stock Twin Cam engines operating at approximately 8 PSI of hot idle oil pressure.

With an upgraded oil pump and cam plate, he's seen hot idle pressure increase to approximately 12–14 PSI.

Highway oil pressure may also improve from around 26 PSI to approximately 30 PSI under comparable conditions.

These improvements can help support engine lubrication and may reduce some of the mechanical noise commonly associated with Twin Cam engines.

Mickey also reports that these upgrades can help certain engines run cooler.

Although results vary, improving the oiling system is an important part of building a Twin Cam engine for long-term performance and reliability.

Do You Need Bigger Injectors or a Throttle Body?

Not every Harley-Davidson performance upgrade requires replacing your entire fuel system.

For the street-focused Twin Cam Performance Kits Mickey recommends, larger fuel injectors and throttle bodies are generally unnecessary when the motorcycle has an otherwise compatible, relatively stock engine configuration.

Instead, Mickey recommends combining the kit with:

• A Camshaft Chain Drive Kit with Chain & Sprocket
• A quality performance exhaust system
• A Stage 1 high-flow air cleaner
• Proper ECU tuning

These supporting modifications help the engine take advantage of the upgraded camshaft while maintaining smooth, predictable power delivery.

Professional tuning is particularly important.

Even the best performance parts won't deliver their full potential without the correct fuel and ignition calibration.

A properly tuned motorcycle can provide improved throttle response, smoother operation, and more consistent power throughout the RPM range.

Are Twin Cam Performance Kits Reliable?

Absolutely—when the correct components are selected, installed properly, and maintained.

In fact, reliability is one of the main reasons Mickey recommends these combinations.

Rather than building an aggressively modified engine that requires extensive supporting upgrades, these kits focus on proven components that complement the Twin Cam platform.

The upgraded oil pump, cam plate, lifters, tensioners, and camshafts work together to improve performance while addressing important maintenance considerations.

Mickey describes these combinations as exceptionally dependable when installed correctly.

For riders who want to enjoy their motorcycles without constantly worrying about engine problems, that's a major advantage.

Upgrade Your Harley-Davidson Twin Cam with Mickey Cohen Motorsports

Getting more power out of your Harley-Davidson doesn't have to mean sacrificing everyday rideability.

With the right Harley Twin Cam Performance Kit, you can improve horsepower, increase torque, enhance throttle response, and upgrade important engine components at the same time.

Whether you prefer the low-end pulling power of the 223-6 or the higher-RPM characteristics of the 556, Mickey Cohen Motorsports offers performance combinations designed around how you actually ride.

Our goal is simple: Build Harley-Davidson motorcycles that are faster, stronger, and more enjoyable to ride.

Explore our selection of Performance Harley Davidson parts and find the right upgrades for your Twin Cam engine.

Shop Harley Twin Cam Performance Kits at Mickey Cohen Motorsports

Fitment, camshaft selection, and expected performance gains depend on your motorcycle's model year, engine configuration, and supporting modifications. Consult Mickey Cohen Motorsports before ordering to confirm the appropriate kit for your build. (949) 607-9462