DRAG SPECIALTIES 139663 Piston Set Compression 3-7/16 .020 8.5

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139663 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-7/16 Inch .020 Bore 8.5 Compression Ratio Harley Davidson fits DS

Introducing the 139663 DS Piston Set from Harley-Davidson, specifically designed for Harley-Davidson V-Twin engines with a piston bore size of 3-7/16 inches and a compression ratio of 8.5:1. This piston set is an essential upgrade for Harley-Davidson enthusiasts who are looking to enhance their engine performance and achieve superior power output.

Each piston in this set is meticulously crafted using high-quality forged aluminum alloy, ensuring superior strength and durability. The piston crowns are engineered to provide an optimal compression height for efficient combustion, resulting in increased power and torque. The piston skirts are designed with a state-of-the-art coating to minimize friction and wear, ensuring a smooth and efficient engine operation.

Moreover, the DS piston design features a divider skirt that separates the piston skirt from the piston crown. This innovative design helps to reduce piston-to-cylinder wall friction, resulting in reduced engine heat, improved ring seal, and longer ring life.

The pistons come with matching piston rings, which are made of high-performance materials to provide an excellent seal between the piston and cylinder walls. The rings are designed to fit perfectly with the pistons to ensure optimal sealing and prevent engine blowby.

This piston set is a direct replacement for the original equipment pistons and comes with all necessary hardware for installation. It is designed to fit Harley-Davidson engines with a stroke length of 4.375 inches and a connecting rod length of 5.6875 inches.

In summary, the 139663 DS Piston Set from Harley-Davidson is an excellent upgrade for Harley-Davidson V-Twin engines. With its superior strength, advanced design features, and high-performance materials, this piston set is sure to provide increased power, improved efficiency, and longer engine life. Whether you are a seasoned Harley-Davidson rider or a dedicated enthusiast, this piston set is an investment that will pay off in the long run.

The 139663 DS Piston Set 3-7/16 020 8.5 compression pistons from Harley-Davidson are designed to enhance the performance of Harley-Davidson engines. Here are some potential pros and cons of buying this piston set:

1. Increased Performance: These pistons offer an 8.5:1 compression ratio, which can lead to improved engine performance, including increased horsepower and torque.

2. OEM Quality: As they are manufactured by Harley-Davidson, these pistons are of high quality and are designed to fit perfectly in your engine.

3. Improved Durability: The pistons are made with durable materials that can withstand the rigors of high-performance riding.

4. Enhanced Engine Look: The new pistons can give your engine a fresh and updated look.

1. Cost: These pistons are more expensive than stock pistons, which may be a deterrent for some riders.

2. Installation Complexity: Installing these pistons requires a significant amount of mechanical knowledge and experience. It may be best to have them installed by a professional.

3. Potential Powerband Shift: With the increased compression ratio, the powerband of your engine may shift, which could take some getting used to.

The 139663 DS Piston Set 3-7/16 020 8.5 compression pistons from Harley-Davidson offer numerous benefits, including improved performance, OEM quality, and enhanced durability. However, they come with a higher cost and installation complexity. Ultimately, the decision to buy these pistons depends on your budget, mechanical abilities, and desired performance level.

If you're looking to significantly improve the performance of your Harley-Davidson engine and have the budget and mechanical expertise to install these pistons, then this piston set is an excellent choice. However, if you're on a tight budget or lack the mechanical ability to install them, then it may be best to consider other options. Additionally, be aware that the powerband of your engine may shift after installation, so be prepared for that adjustment.

Details:

Harley Davidson FL 80 Electra Glide 1980. In.Engine Type Shovel head/ Aluminum Quantity Pair Size Over Standard .020 in. Harley Davidson FL 1948. DS Piston Set 3-7/16 .020 Bore 8.5:1 Compression Ratio Harley Davidson: Pistons come complete with wrist pins and cir clips sold in pairs.

Piston rings are not included.

part #: 139663 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139663
• part type: Piston Compression
• warranty details: See Manufacturer

returns pistondon:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

shipping pistondon:

• transit: 2-4 Days
• service: UPS Ground
• carrier: UPS
• cost: $0.00
• class: Standard
• type: Fixed

seller pistondon:

• rating: 99.7%
• # reviews: 688355
• city: Grand Rapids, Michigan

payments pistondon:

• credit card: Diners-club
• wallet: Google-pay
• other

offer pistondon:

• started: March 16, 2026
• quantity: 2
• options: Ship-to-home
• sold: 0
• availability: In Stock

general pistondon:

• condition: New
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits

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