1. Motorcycle Cylinder Heads & Valve Covers For Sale
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  3. MID USA 61391

MID USA 61391 Cylinder Head Roller Rocker Arm Set Evolution 84-17 Cam

fits model: Twin. make: Harley.

61391 Mid Usa Cylinder Head Roller Rocker Arm Set 84-17 Harley Evolution Twin Cam

( Brand: Mid Usa ), ( Manufacturer Part Number: 61391 ), ( Engine Type: 4-stroke ), ( Type: Cylinder Head Assembly ), ( Machine Type: Street Motorcycle ), ( Material: Cast Iron )

Review MID USA Cylinder Head Roller Rocker Arm Set 84-17 Harley Evolution Cam fits TWIN

The 61391 Cylinder Head Roller Rocker Arm Set is a premium replacement part designed specifically for Harley-Davidson Evolution Twin Cam engines manufactured between 1984 and 2017. This set is an essential upgrade for any motorcycle enthusiast seeking optimal engine performance and improved durability.

Each roller rocker arm in this set is meticulously crafted using high-quality materials, ensuring a perfect fit and long-lasting functionality. The roller tip design minimizes friction between the rocker arms and the camshaft, reducing wear and tear, and enhancing power delivery.

The roller rocker arms are also equipped with precision-machined roller bearings. These bearings provide a smoother rocking motion, reducing engine noise, and improving engine efficiency. The bearings are engineered to last, ensuring a reliable and hassle-free riding experience.

The set includes eight roller rocker arms, which are suitable for both the intake and exhaust valves on each cylinder. Each rocker arm comes with the necessary hardware for installation, making the process as straightforward as possible.

Installing the 61391 Cylinder Head Roller Rocker Arm Set is a straightforward process, requiring no special tools or extensive mechanical knowledge. It is an excellent upgrade for any Harley-Davidson Evolution Twin Cam engine, delivering improved performance, durability, and a smoother, quieter ride.

In conclusion, the 61391 Cylinder Head Roller Rocker Arm Set is a must-have upgrade for any Harley-Davidson Evolution Twin Cam motorcycle produced between 1984 and 2017. With its high-quality materials, precision engineering, and straightforward installation process, this set is an investment in the longevity and performance of your motorcycle.

Buying a (61391 cylinder head roller rocker arm set 84-17 for Harley-Davidson Evolution Twin Cam engines comes with several pros and cons that every buyer should consider before making a purchase.

Pros:

1. Improved Performance: The roller rocker arms provide smoother operation, reducing friction and allowing for better engine breathing. This can lead to improved horsepower and torque.

2. Enhanced Durability: Roller rocker arms last longer than traditional flat-tappet designs, as they do not wear out the valve train as quickly. This can save you money in the long run by reducing the need for frequent rebuilds or replacements.

3. Quieter Operation: The roller rocker arms produce less noise than flat-tappet designs, resulting in a quieter engine operation.

4. Easy Installation: The roller rocker arm set comes with all the necessary components for installation, making it a relatively straightforward process for experienced DIYers.

Cons:

1. Cost: The roller rocker arm set can be more expensive than a standard flat-tappet set. The cost may be a significant consideration for some buyers, especially those on a tight budget.

2. Compatibility: The roller rocker arm set may only be compatible with certain engines or engine modifications. Be sure to verify that the set is compatible with your specific application before making a purchase.

3. Limited Aftermarket Support: While there are aftermarket options for roller rocker arms, the selection may be more limited compared to flat-tappet designs. This could make it more difficult to find replacement parts or upgrades in the future.

In conclusion, the decision to buy a (61391 cylinder head roller rocker arm set 84-17 for Harley-Davidson Evolution Twin Cam engines depends on your specific needs and priorities. If you value improved performance, enhanced durability, and quieter operation, then the investment in a roller rocker arm set may be worthwhile. However, if cost is a significant concern, or if you require extensive aftermarket support, then a flat-tappet design may be a more suitable option. Ultimately, it is essential to weigh the pros and cons carefully and consult with a Harley-Davidson expert or trusted mechanic to ensure that you make the best decision for your engine.

Based on the information provided, my recommendation would be for those who prioritize improved performance and enhanced durability, as well as those who are willing to invest in a higher-quality component, to consider purchasing the (61391 cylinder head roller rocker arm set 84-17 for Harley-Davidson Evolution Twin Cam engines. However, for those who have cost concerns or require extensive aftermarket support, a flat-tappet design may be a more suitable alternative.

Details:

Cylinder Head Roller Rocker Arm Set 84-17 Harley Evolution Twin Cam 61391, ROLLER ROCKER ARM SET BT EVO 84/99,TC 99/17 SPORTSTER 86/LATER, Arms for Evo Engines. They incorporate a 1.675 ratio for increased lift. Made from 4140 steel forgings. Uses OEM rocker shafts.

part #: 61391 price

  • $171.60

specifications cylindermotorcycleiz:

  • for models: Twin
  • for makes: Harley
  • brand: Mid Usa
  • mpn: 61391
  • engine type: 4-stroke
  • type: Cylinder Head Assembly
  • machine type: Street Motorcycle
  • material: Cast Iron

seller cylindermotorcycleiz:

  • city: Hazelwood, Missouri
  • rating: 99.2%
  • # reviews: 22864

offer cylindermotorcycleiz:

  • options: Ship-to-home
  • quantity: 1
  • started: December 10, 2025
  • sold: 0
  • availability: In Stock

payments cylindermotorcycleiz:

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

general cylindermotorcycleiz:

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

returns cylindermotorcycleiz:

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

shipping cylindermotorcycleiz:

  • carrier: UPS
  • cost: $0.00
  • class: Standard
  • transit: 2-6 Days
  • service: UPS Ground
  • type: Fixed
for models: twin, for makes: harley, engine type: 4-stroke, type: cylinder head assembly, machine type: street motorcycle,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > cylinder heads, material: cast iron, sku: 13169831290256603,
Mid Usa 61391 Is Similar To:
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1 offer $171.60 USD
  • New. Offer #1 priced at $171.60 + $15.00 shipping estimate = $186.60* total. These are forged from 4140 steel and incorporate a 1.675 ratio for increased lift while still using your OEM rocker shafts.+$15.00 shipping

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