HARLEY-DAVIDSON 16666-70 Cylinder Heads Rocker Fx 74CI

( Brand: Harley-davidson ), ( Manufacturer Part Number: 16666-70 ), ( Engine Type: 4-stroke ), ( Type: Cylinder Head Assembly ), ( Machine Type: Dual Sport Motorcycle, Off-road Motorcycle, Street Motorcycle ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Oem 74ci Cylinder Heads And Rocker Boxes Fx fits SHOVELHEAD FLH FXE FL 1970

The Harley-Davidson 16666-70 1970-1974 Shovelhead Cylinder Heads are a essential upgrade for any Harley-Davidson FLH, FX, or FXE motorcycle model that utilizes the iconic Shovelhead engine. These cylinder heads are meticulously crafted with precision and care, offering a significant improvement in power and performance over the stock heads.

Each head is equipped with a unique design, featuring a large combustion chamber, which allows for more efficient fuel-air mixture and a more complete combustion process. The large ports and generous intake and exhaust valves enhance the engine's breathing capabilities, resulting in increased horsepower and torque.

The heads are constructed of high-quality aluminum alloy, ensuring durability and longevity. The cooling fins are strategically placed to maximize heat dissipation, preventing overheating and ensuring optimal engine performance.

The rocker arms are designed to provide a more efficient transfer of power from the valves to the pistons, resulting in smoother engine operation and improved throttle response. The rocker arms are also made of high-strength steel, providing added durability and reliability.

These cylinder heads are a direct fit for Harley-Davidson FLH, FX, and FXE motorcycles with the Shovelhead engine, making installation a straightforward process. Additionally, the heads are compatible with various aftermarket performance parts and modifications, allowing for further customization and tuning.

In summary, the Harley-Davidson 16666-70 1970-1974 Shovelhead Cylinder Heads offer a significant increase in power and performance, enhanced durability, and improved engine efficiency. These heads are a must-have for any Harley-Davidson enthusiast looking to take their Shovelhead engine to the next level.

Harley-Davidson Shovelhead cylinder heads, specifically model number 16666-70, were used on various Harley-Davidson motorcycles from 1970 to 1974. These heads are popular among collectors and restorers due to their unique appearance and historical significance. Here are some pros and cons of buying these cylinder heads for your Harley-Davidson motorcycle.

1. Authenticity: These cylinder heads are original parts from Harley-Davidson's Shovelhead era, adding to the historical value and authenticity of your motorcycle.

2. Performance: The Shovelhead engine is known for its powerful and distinctive sound. These cylinder heads are part of what contributes to that unique performance.

3. Rarity: Due to their age and specific model number, these cylinder heads may be difficult to find, making them a desirable and valuable investment for collectors.

1. Cost: Original Harley-Davidson Shovelhead cylinder heads can be expensive, especially if they are in good condition or have desirable features.

2. Availability: Due to their age and rarity, these cylinder heads may be difficult to find, and you may need to search extensively to locate a good used one or purchase a new replica.

3. Compatibility: These cylinder heads are only compatible with specific Harley-Davidson models and years. Make sure you have the correct application before purchasing.

Harley-Davidson Shovelhead cylinder heads, specifically model number 16666-70, offer a unique combination of historical significance, performance, and rarity. However, they can be expensive and difficult to find, and only fit specific Harley-Davidson models and years. If you are a serious collector or restorer, these cylinder heads may be a worthwhile investment. Otherwise, consider the cost and availability before making a purchase.

If you are looking for authentic Harley-Davidson Shovelhead cylinder heads and have the budget and the need for them, then go ahead and purchase. However, if you are unsure about the compatibility, availability, or cost, consider alternative options such as replica cylinder heads or other performance upgrades for your Harley-Davidson motorcycle.

Details:

Please view photos and inspect as well. Shipping costs are estimates. One very small chip on the front-side intake lip; otherwise no major damage or visible repairs. A strong candidate for a correct restoration or rider build.

Light grime, patina, and minor scuffs consistent with honest use. Casting date codes visible on the heads read 05 66 and 07. Condition: Very good OEM used condition. Castings present nicely and remain structurally solid.

More coming soon. Ideal for a period-correct FLH Electra Glide or FX Super restoration. I do my best to describe everything accurately, but don't know every single detail for year and model. Rocker boxes retain older chrome finish with natural aging.

OEM Harley-Davidson Shovelhead cylinder head and rocker box set removed from a 1970 74ci 1200cc engine. This is a correct early Cone Shovel configuration utilizing earlier casting heads commonly seen during the transition period. More parts available. FITMENT:Direct OEM fit for 1970 Harley-Davidson FL and FX 74ci Shovelhead model's.

Please examine photos for condition and quality. Harley frequently used earlier-produced castings in later assemblies, especially during the 1970 model year. Whats pictured is whats included. I ll gladly combine shipping on multiple orders.

Please see my other listings.

part #: 1666670 prices

• $61.49-$679.99

specifications cylindermotorcycleiz:

• for models: Flh, Fxe, Fl, Shovelhead
• for makes: Harley
• for years: 1970
• brand: Harley-davidson
• mpn: 16666-70
• engine type: 4-stroke
• type: Cylinder Head Assembly
• machine type: Dual Sport Motorcycle, Off-road Motorcycle, Street Motorcycle
• vintage part: Yes
• country of origin: United States

offer cylindermotorcycleiz:

• started: March 3, 2026
• availability: In Stock
• options: Ship-to-home
• sold: 0
• quantity: 1
• best offers: True

general cylindermotorcycleiz:

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

returns cylindermotorcycleiz:

• policy: No Returns

payments cylindermotorcycleiz:

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

shipping cylindermotorcycleiz:

• carrier: USPS
• transit: 4-10 Days
• type: Fixed
• service: USPS Ground Advantage
• cost: $0.00
• class: Standard

seller cylindermotorcycleiz:

• rating: 99.5%
• city: Powhatan, Virginia
• # reviews: 3966

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