Choosing the right high performance cylinder heads for your Harley Davidson Big Twin can significantly boost your engine’s power and efficiency. In this roundup, I’ve highlighted five top options, including the versatile S&S Cycle High Compression Cylinder Heads, ideal for those seeking increased airflow with stock components, and the S&S Performance Replacement Cylinder Head Kit for Evo engines, which offers great value for smaller displacement engines. Meanwhile, the S&S Cycle Super Stock Cylinder Head Kit 106-3240 makes sense for riders with 2006-2012 models wanting bolt-on performance. Each choice balances performance gains with specific compatibility and budget considerations, but they differ in installation complexity, durability, and targeted engine years.
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Keep in mind that high-performance heads often require specific pistons or gaskets, and some are better suited for experienced builders. The main tradeoffs involve ease of installation versus maximum airflow and compression. Here, I’ve broken down what matters most for different riding needs.
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Key Takeaways
- High compression heads improve airflow and power but may need compatible pistons and tuning.
- Some options are designed specifically for certain engine years, limiting versatility.
- Fully assembled heads save installation time but can be more expensive.
- Durability factors like coatings and materials impact longevity and maintenance.
- Compatibility with stock components varies, influencing ease of upgrade.
| S&S Cycle High Compression Cylinder Heads |  | Best Overall for Performance and Compatibility | Valves: Stainless 1.900in. intake, 1.575in. exhaust | Spring: High-lift (.585in.) springs | Chamber Volume: 76cc | VIEW ON AMAZON | See Our Full Breakdown |
| S&S Performance Replacement Cylinder Head Kit for Harley Davidson 1984-99 Evo Big Twin engines |  | Best for Small Displacement Revamp | Application: Harley Davidson 1984-99 Evo Big Twin | Material: Stainless steel valves | Spring Lift: .585 inches | VIEW ON AMAZON | See Our Full Breakdown |
| S&S Cycle Super Stock Cylinder Head Kit 106-3240 |  | Best for 2006-2012 Dyna and Big Twin Models | Color: Black | Capacity: 89cc | Application: 99-12 Big Twin (excluding 2006 Dyna) | VIEW ON AMAZON | See Our Full Breakdown |
| S&S Cycle Performance Replacement Cylinder Heads for Evolution Big Twin Engines |  | Best Budget Performance Upgrade | Material: Black powder coating | Application: Evolution Big Twin engines | Compatibility: Stock-style flat-top pistons | VIEW ON AMAZON | See Our Full Breakdown |
| S&S Cycle Super Stock Cylinder Head Kit | | Best for 1999-2006 Street Big Twin | Primary Color: Black | Size: 89cc | Application: 99-06 Big Twin (excluding 2006 Dyna) | VIEW ON AMAZON | See Our Full Breakdown |
| high performance cylinder heads for harley davidson big twin | Application | Material |
|---|---|---|
| S&S Cycle High Compression Cyl | — | Fully assembled heads |
| S&S Performance Replacement Cy | Harley Davidson 1984-99 Evo Big Twin | Stainless steel valves |
| S&S Cycle Super Stock Cylinder | 99-12 Big Twin (excluding 2006 Dyna) | — |
| S&S Cycle Performance Replacem | Evolution Big Twin engines | Black powder coating |
| S&S Cycle Super Stock Cylinder | 99-06 Big Twin (excluding 2006 Dyna) | — |
More Details on Our Top Picks
S&S Cycle High Compression Cylinder Heads
This set stands out for its blend of airflow improvements and ease of use with stock components. Fully assembled and featuring stainless valves and high-lift springs, they boost compression while maintaining factory-like compatibility. Compared with other options, these heads are versatile enough for street performance, yet require a skilled hand for proper installation. They’re ideal for riders seeking a straightforward yet significant upgrade, though they demand compatible pistons and manifolds for optimal results. The American-made quality and stainless components add to their appeal, but the need for precise matching limits their use for casual DIYers.
Pros:- High airflow design with stainless valves
- Compatible with stock pistons and EFI
- Made in the USA with quality standards
Cons:- Requires specific pistons and manifolds for best results
- Not suited for amateur installation without experience
Best for: Experienced builders wanting a reliable, high-performance upgrade without extensive modifications
Not ideal for: Beginners or those seeking a quick, low-cost fix without engine tuning
- Valves:Stainless 1.900in. intake, 1.575in. exhaust
- Spring:High-lift (.585in.) springs
- Chamber Volume:76cc
- Material:Fully assembled heads
- Compatibility:Stock-style flat-top pistons, OEM intake, EFI
- Sold in:Pairs
Our verdict“A well-rounded choice for seasoned builders seeking a balance of performance and compatibility.”
S&S Performance Replacement Cylinder Head Kit for Harley Davidson 1984-99 Evo Big Twin engines
This kit offers a tailored upgrade for Evo Big Twin engines from 1984 to 1999, emphasizing increased airflow and compression within smaller displacement engines. Fully assembled with stainless steel valves and high-lift springs, it’s a smart choice for riders looking to enhance performance in older models. Compared to the other heads, these are optimized for specific engine years, which means they’re less versatile but excel in their niche. They come in durable powder-coat finishes, making them suitable for street riding. However, they don’t include intake manifolds or gaskets, so additional parts are necessary for installation.
Pros:- Optimized for increased airflow and compression
- Stainless steel valves with high-lift springs
- Available in durable powder-coat finishes
Cons:- Intake manifolds and gaskets sold separately
- Limited to specific engine years, reducing versatility
Best for: Owners of 1984-99 Evo Big Twin engines seeking a straightforward power boost
Not ideal for: Riders with newer engines or those wanting a universal head upgrade
- Application:Harley Davidson 1984-99 Evo Big Twin
- Material:Stainless steel valves
- Spring Lift:.585 inches
- Chamber Volume:82cc
- Finish:Silver or black powder-coat
- Set Includes:Heads (sold in pairs)
- Made in:USA
Our verdict“A solid choice for upgrading older Evo engines with a focus on street performance.”
S&S Cycle Super Stock Cylinder Head Kit 106-3240
This head kit focuses on bolt-on performance with a durable black powder-coat finish and an 89cc chamber capacity. It’s designed to bolt onto most stock components, making it a popular choice for riders who want a straightforward upgrade for 2006-2012 models. Compared to the more specialized heads, this kit offers a balance of performance and ease of installation, particularly for street riders. The downside is that stock rocker boxes won’t work with electric compression releases, and some components like head bolts might need replacement. It’s a reliable upgrade, but not the most aggressive option available.
Pros:- Easy bolt-on installation
- Black powder-coat finish enhances durability
- Suitable for street performance
Cons:- Limited to specific model years
- Rocker box incompatibility with electric releases
Best for: Street riders with 2006-2012 Harley Dyna or Big Twin models wanting a simple bolt-on boost
Not ideal for: Owners of earlier or later models or those seeking maximum airflow at all costs
- Color:Black
- Capacity:89cc
- Application:99-12 Big Twin (excluding 2006 Dyna)
- Weight:29 pounds
- Dimensions:18 x 11.3 x 11.3 inches
Our verdict“A practical, no-fuss upgrade for mid-2000s Harley models focused on street riding.”
S&S Cycle Performance Replacement Cylinder Heads for Evolution Big Twin Engines
This option provides a performance bump for Evolution Big Twin engines, with a simple black powder coating for added longevity. While detailed specifications are limited, it offers a straightforward upgrade path for owners looking to improve engine breathing without major modifications. Compared to other heads, it’s a more economical choice, but that often means less detailed information on airflow improvements or durability. It’s best suited for those who want a reliable upgrade without the fuss, especially if they already have stock heads that need replacing.
Pros:- Cost-effective upgrade
- Black powder coating for durability
- Compatible with stock-style flat-top pistons
Cons:- Limited technical detail and specs
- Not suitable for high-end performance builds
Best for: Budget-conscious owners wanting a performance increase with minimal fuss
Not ideal for: Riders seeking maximum airflow or detailed technical specs
- Material:Black powder coating
- Application:Evolution Big Twin engines
- Compatibility:Stock-style flat-top pistons
Our verdict“A sensible choice for budget upgrades that improve engine performance modestly.”
S&S Cycle Super Stock Cylinder Head Kit
This kit emphasizes durability and street performance for Harley Big Twins from 1999 to 2006, excluding Dyna models of 2006. The black finish and 89cc chambers make it a reliable upgrade for riders looking to improve power on street bikes. Compared to other options, it’s straightforward and durable, but limited to specific years and not compatible with Dyna models of 2006. It’s an excellent choice for riders focused on street durability rather than maximum airflow or racing specs.
Pros:- Improves engine performance
- Durable black finish
- Designed for street use
Cons:- Limited to specific years
- Not suitable for 2006 Dyna models
Best for: Street riders with 1999-2006 Big Twin Harley models seeking a durable upgrade
Not ideal for: Owners of newer models or those seeking the highest airflow performance
- Primary Color:Black
- Size:89cc
- Application:99-06 Big Twin (excluding 2006 Dyna)
Our verdict“A dependable upgrade for street-oriented Big Twins from the late 90s and early 2000s.”
How We Picked
My selection process focused on balancing performance enhancements with compatibility, build quality, and ease of installation. I prioritized heads that are fully assembled, use quality materials like stainless steel valves, and are designed for specific engine years to avoid mismatched parts. I also considered user feedback on durability and installation, aiming to identify options that deliver real gains without unreasonable complexity or cost. While I avoided products with vague specifications or limited availability, I made sure each pick fills a distinct role, from budget-friendly replacements to premium upgrades.
| high performance cylinder heads for harley davidson big twin | Material |
|---|---|
| S&S Cycle High Compression Cyl | Fully assembled heads |
| S&S Performance Replacement Cy | Stainless steel valves |
| S&S Cycle Super Stock Cylinder | — |
| S&S Cycle Performance Replacem | Black powder coating |
| S&S Cycle Super Stock Cylinder | — |
Factors to Consider When Choosing High Performance Cylinder Heads For Harley Davidson Big Twin
When selecting high performance cylinder heads for your Harley Davidson Big Twin, several factors come into play. The intended use—whether street riding, racing, or casual upgrades—will influence your choice. Compatibility with your engine year and existing components is essential to avoid costly mismatches. Material quality, airflow capacity, and ease of installation also matter, especially if you plan to do the work yourself. Understanding these aspects helps ensure you get a head that matches your performance goals and riding style.
Performance Goals and Compatibility
Decide whether you want a subtle power increase or a significant boost for racing. Heads designed for specific engine years provide easier fitment, but limit versatility. Fully assembled heads save time but often come at a premium, while kit options allow customization. Matching head specs with pistons and manifolds is crucial for maximizing performance and reliability.
Materials and Finish
Stainless steel valves and durable coatings like black powder-coat increase longevity and resistance to heat and corrosion. These factors are especially important if you ride frequently or in harsh conditions. Cheaper finishes may reduce upfront costs but can compromise durability over time.
Ease of Installation and Cost
Some heads are bolt-on, suitable for DIY installation, while others require professional setup. Budget options tend to be less detailed but can still deliver performance gains. Weigh your comfort with installation complexity against your performance expectations to choose wisely.
Frequently Asked Questions
Are high performance cylinder heads suitable for daily street riding?
Yes, many high performance heads are designed to improve airflow and compression for street use, especially models like the S&S Super Stock and High Compression heads. However, they may require tuning and compatible pistons to optimize reliability and performance, so it’s important to match the head to your specific bike and riding habits.
Will installing high compression heads affect my engine’s longevity?
Increased compression can put additional stress on engine components, potentially reducing longevity if not paired with proper tuning and quality parts. Choosing heads with high-quality materials and ensuring correct installation helps mitigate these risks and extends engine life.
Can I install these heads myself, or do I need a professional?
Some heads, particularly bolt-on models like the Super Stock kits, are suitable for experienced DIY enthusiasts. Others, such as the fully assembled high compression heads, may require professional installation to ensure proper sealing, timing, and tuning. Assess your skill level before attempting a complex upgrade.
Are these heads compatible with stock manifolds and pistons?
Most heads like the S&S High Compression and Super Stock kits are designed for compatibility with stock components, but some may require specific pistons or manifolds for optimal performance. Always check manufacturer recommendations to avoid fitment issues.
How much performance gain can I expect from these heads?
Depending on the model and setup, gains can range from modest improvements in airflow and throttle response to significant horsepower increases suitable for racing. Heads like the High Compression set are engineered for noticeable power gains, but actual results depend on accompanying modifications and tuning.
Conclusion
If you primarily ride on the street and want a reliable, easy upgrade, the S&S Cycle Super Stock Cylinder Head Kit makes the most sense for 2006-2012 models. For owners of older Evo engines, the S&S Performance Replacement Cylinder Head Kit offers a cost-effective boost. Experienced builders aiming for maximum airflow and power should consider the S&S Cycle High Compression Cylinder Heads for their versatility and quality. Beginners or budget-conscious riders might opt for the S&S Cycle Performance Replacement Heads, but they should be prepared for additional tuning and part matching. Ultimately, your choice depends on your engine year, riding style, and performance goals.
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