S-S CYCLE Cylinder Heads Cam 7/8 .640 Reviews 90-1104S

( Brand: S-s Cycle ), ( Manufacturer Part Number: 90-1104 ), ( Type: Cylinder Head ), ( Finish: Black )

Review S CYCLE Scycle 90-1104sblack 7/8 Bore Cylinder Heads Harley Cam .640 fits TWIN 1999–2005

Introducing the Cycle 90-1104S 7/8 Cylinder Heads for Harley-Davidson Twin Cam 99-05 engines. These high-performance cylinder heads are meticulously designed and engineered to deliver enhanced power, improved throttle response, and increased fuel efficiency for your Harley-Davidson motorcycle.

The 90-1104S cylinder heads are crafted using only the finest materials, including a high-strength aluminum alloy for durability and lightweight design. The 7/8 size is compatible with most aftermarket intake and exhaust systems, making it an ideal choice for customization and performance upgrades.

The cylinder heads come with 640 intake and exhaust ports, which are CNC-machined for precise dimensions and smooth flow. The ports are also optimized for efficient fuel delivery, ensuring optimal combustion and power output.

The 90-1104S cylinder heads feature a unique design with increased valve size and improved valve angles. These enhancements provide better breathing and improved engine performance, resulting in increased horsepower and torque.

The heads come with stainless steel valves and high-performance valve springs, ensuring reliable operation and consistent performance under extreme conditions. The valves are also adjustable, allowing fine-tuning of the engine for optimal performance and efficiency.

The 90-1104S cylinder heads are designed to work seamlessly with your Harley-Davidson's electronic fuel injection system, ensuring precise fuel delivery and optimal engine performance. The heads also come with new O-ring gaskets for a secure seal and easy installation.

In summary, the Cycle 90-1104S 7/8 Cylinder Heads for Harley-Davidson Twin Cam 99-05 engines are a high-performance upgrade that delivers increased power, improved throttle response, and enhanced fuel efficiency. The heads are meticulously designed and engineered using only the finest materials and advanced manufacturing techniques, making them a must-have for any serious Harley-Davidson enthusiast or performance builder.

Buying Harley-Davidson Twin Cam 90-1104 7/8 inch cylinder heads (Model 90-1104) for your Harley Davidson motorcycle between the years 1999 and 2005 (640 cubic inch engine) comes with several pros and cons.

1. Improved Performance: Upgrading to 90-1104 cylinder heads can lead to increased power output and improved engine performance. The new heads feature larger intake ports, improved combustion chamber design, and enhanced cooling capabilities, leading to better overall performance.

2. Better Fuel Efficiency: The improved combustion process and more efficient cooling system can result in better fuel efficiency. While this might not be a significant improvement, every little bit helps in reducing fuel costs.

3. Enhanced Durability: The 90-1104 cylinder heads are known for their increased durability. They are made from stronger materials and have more robust design features, making them less prone to wear and tear.

4. Customization: Upgrading to these cylinder heads allows for greater customization of your motorcycle engine. This can be a significant advantage for those who enjoy tinkering with their bikes and want to make them unique.

5. Increased Resale Value: Installing high-performance parts like the 90-1104 cylinder heads can increase the resale value of your motorcycle. Potential buyers often look for upgraded parts when considering a used motorcycle purchase.

1. Cost: Upgrading to the 90-1104 cylinder heads can be a costly endeavor. The heads themselves are not cheap, and the installation process requires professional labor and additional parts.

2. Compatibility: While the 90-1104 cylinder heads are designed for Harley Davidson Twin Cam engines between 1999 and 2005, compatibility issues may arise. It is crucial to ensure that the heads are compatible with your specific motorcycle model and year.

3. Complex Installation: Installing the new cylinder heads requires professional expertise. The process involves removing the old heads, installing the new ones, and adjusting the valves, among other things.

4. Potential Engine Noise: Some users have reported increased engine noise after installing the 90-1104 cylinder heads. This could be due to the improved airflow and combustion process, but it may not be desirable for all riders.

5. Risk of Damage: Upgrading the cylinder heads involves removing the old ones, which can lead to potential damage if not done correctly. This risk is heightened if the installation is not performed by a professional.

Upgrading to Harley-Davidson Twin Cam 90-1104 7/8 inch cylinder heads (Model 90-1104) for your 1999-2005 Harley Davidson motorcycle (640 cubic inch engine) can offer significant performance improvements, increased durability, and better fuel efficiency. However, the high cost, potential compatibility issues, complex installation process, risk of damage, and possible engine noise are important considerations. Ultimately, the decision to upgrade depends on your personal preferences, budget, and riding style. If you are a performance enthusiast and are willing to invest the time and money, then the upgrade could be worthwhile. Otherwise, it may be best to stick with the stock cylinder heads.

Details:

1.940 Intake. 640 lift 4ft springs. New Old Stock has slight surface rust on springs. For a 99-05 Harley Big Twin Cam.

Has a 79cc Chamber.

part #: 901104 price

• $1800.00

specifications cylindermotorcycleiz:

• for models: Twin
• for makes: Harley
• for years: 1999-2005
• brand: S-s Cycle
• mpn: 90-1104
• type: Cylinder Head
• finish: Black

payments cylindermotorcycleiz:

• other
• wallet: Apple-pay
• credit card: Discover

offer cylindermotorcycleiz:

• quantity: 1
• sold: 0
• options: Ship-to-home
• started: May 12, 2026
• availability: In Stock

general cylindermotorcycleiz:

• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads
• condition: New

seller cylindermotorcycleiz:

• rating: 100.0%
• # reviews: 122
• city: Ukiah, California

returns cylindermotorcycleiz:

• policy: No Returns

shipping cylindermotorcycleiz:

• transit: 3-8 Days
• type: Calculated
• cost: $71.88
• class: Standard
• carrier: USPS
• service: USPS Ground Advantage

S-s Cycle 90-1104 Is Similar To:

• 100-0480 Used Cycle Super Stock Cylinder Heads Black From (45.3% similar) Thees part number for these heads is this an old and no longer in catalog. The retail price on these heads is are not machined for compression releases because T111 uses easy start cams. These heads are specifically for the T111 I'm not sure they will fit any other motor. I do not make any money on ...(February 28th, 2018)
• 106-1619 S Cycle Cover Cam (28.3% similar) For more details: motor city sports center, inc. Expedited shipping with delivery confirmation is available. Return number must be on the outside of box, otherwise package will refused. Actual parts may vary in appearance based on your model. A manufacturer:s Cycle manufacturer number: made in: us ...(September 16th, 2017)
• 106-1625 S Cycle Cover Cam (28.3% similar) Motor city sports center, inc. This image is a manufacturers photo and meant to be representative of the item listed. This occasionally happens, and is rare. Some images show accessories that are not included with the product. Fitment data may not list all model's and years that is 100 correct...(December 14th, 2017)
• Heads Stock Cycle 106-3227 Cylinder Silver 79cc (40.3% similar) Compare the microfiche for the USA model to your model to be sure they are the same. Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder coat. 79CC heads work great with stock motors for 88 to 103CI motors 89CC heads work best for motors over 103CI ...(January 9th, 2015)
• Cylinder 106-3233 79cc Black Cycle Stock Heads (21.9% similar) Heads are machined for compression releases sold separately rocker boxes required when sings compression releases. Most slip on, bolt on and full system street exhausts, and rims and other large box items do not qualify for the combined shipping discount. 605 inch exhaust. Compare the microfiche for...(January 1st, 2015)
• Cylinder Black 89cc Stock Cycle 106-3240 Heads (21.9% similar) Note image may not be actual item and may differ depending on your vehicle fitment. Made in the us. Does not include rocker arm components, intake manifold, gaskets or deadbolts requires eight long oem length head bolts. Stock cylinder heads 89CC blacks super stock cylinder heads for twin cam 79CC...(December 30th, 2014)
• 106-4039 S Cycle Stock Bore (29.9% similar) Note: installation in flt model's requires oil line kit part, but the stock transmission cover may be used. Our phone number is. Expedited shipping with delivery confirmation is available. This occasionally happens, and is rare. For more details: motor city sports center, inc. Images are the ...(July 18th, 2017)
• 106-4211 S Cycle Chrome Cam (28% similar) Our phone number is. Manufacturer:s Cycle manufacturer number: fits: harley big twin note: image shown is for reference only. Expedited shipping with delivery confirmation is available. This occasionally happens, and is rare. Return number must be on the outside of box, otherwise package will ...(May 15th, 2017)
• 106-4570 Cylinder Cycle Heads Black Evo (38.7% similar) Port design increases flow, while maintaining velocity. Available in silver powder coat or black powder coat finish. Intake manifold and gasket kits are sold separately. 585 inch springs. Please with any questions or concerns and we'll be happy to help. The highest shipping price will not be ...(December 30th, 2014)
• 106-5234 S Cycle Cam Ez (23.3% similar) Fitment data may not list all model's and years that is 100 correct. Note: not for model's with oem compression releases. Note: installer must check coil bind, valve-to-valve clearance and valve-to-piston. This occasionally happens, and is rare. Some images show accessories that are not included ...(December 17th, 2017)
• 11655 Harley Cycle Cylinder Head Aluminum (41.3% similar) Used, need cleaning paint as pictured. Harley's Cycle cylinder head aluminum standard rear dual plug...(March 31st, 2019)