LYCOMING 68989 Deck Spot Faced Barrel Airboat 0-320-A

( Brand: Lycoming ), ( Manufacturer Part Number: 68989 ), ( Part Type: Deck ), ( Country Of Origin: United States )

Review LYCOMING Narrow Deck Spot Faced Fresh Chrome Barrel Inch Airboat

The **Lycoming 68989 0-320-A Deck Spot-Faced Barrel Airboat Engine** is a robust and legendary powerplant designed for high-performance airboating, offering an unmatched blend of reliability, raw power, and rugged durability. Built to withstand the harshest conditions on the water, this air-cooled, horizontally opposed, four-cylinder engine delivers a formidable **320 horsepower** at 3,600 RPM, making it an ideal choice for serious airboat operators seeking both speed and endurance. The **deck spot-faced barrel design** ensures a secure and precise mounting interface, allowing for easy installation and alignment on virtually any airboat frame, whether it s a custom-built vessel or a modified classic. With a displacement of **320 cubic inches**, this engine combines a smooth, torque-rich performance with a distinctive Lycoming sound that resonates with purists and enthusiasts alike.

Under the hood, the **0-320-A** features a cast-iron block and head, reinforced by a robust crankshaft and connecting rods forged for durability, ensuring it can handle the demanding cycles of airboat operation without sacrificing performance. The engine s **barrel-style cylinder heads** are designed for optimal airflow and cooling, while the **pressure-lubricated main bearings** and **hypoid gear reduction** contribute to a longer service life and reduced maintenance requirements. A **mechanical fuel pump** and **carbureted induction system** (standard on this model) provide a reliable fuel delivery method, though aftermarket fuel injection upgrades are readily available for those seeking enhanced efficiency and performance. The **dry sump lubrication system** ensures consistent oil flow even under extreme operating conditions, protecting critical components from wear and tear.

Built for both performance and longevity, the **Lycoming 0-320-A** is equipped with a **single-stage air filter** (though aftermarket high-flow options can be installed for improved cooling) and a **dry sump oil tank**, which helps prevent oil starvation during aggressive operation. The engine s **deck spot-facing** feature allows for a clean, flush mount to the airboat s deck, reducing vibration and improving structural integrity. Whether used in a **swamp buggy, river racer, or commercial airboat**, this engine is engineered to deliver consistent power across a wide RPM range, making it a favorite among builders and racers who demand nothing less than excellence. With proper maintenance including regular oil changes, valve adjustments, and component inspections this Lycoming powerhouse can easily surpass **1,500 hours** of reliable service, cementing its reputation as one of the most dependable engines in the airboat community. For those who demand speed, power, and uncompromising performance, the **Lycoming 68989 0-320-A** remains a timeless choice.

Buying a Lycoming O-320-A deck spot-faced barrel airboat engine, specifically the model 68989, involves several considerations. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying a Lycoming O-320-A Deck Spot-Faced Barrel Airboat Engine**

1. **Proven Reliability and Durability**

The Lycoming O-320 series is a well-established engine design with decades of use in airboats, general aviation, and industrial applications. The O-320-A, in particular, is known for its robust construction, capable of handling the demanding conditions of airboat operation, including high RPMs, vibration, and exposure to water and debris. Many owners report long service lives with proper maintenance.

2. **High Power-to-Weight Ratio**

The O-320-A produces **150 horsepower** (at 2,800 RPM) with a displacement of **320 cubic inches**, making it one of the most powerful airboat engines in its class. This power output is ideal for larger airboats or those operating in rougher waters where extra thrust is required. The barrel design (a modified version of the standard deck spot-faced engine) is optimized for airboat applications, improving airflow and cooling efficiency.

3. **Barrel Design Advantages**

The barrel configuration (a shortened cylinder block with a "barrel" shape) is specifically engineered for airboat use. It reduces weight while maintaining structural integrity, improves cooling by increasing surface area, and allows for easier installation in tight airboat decks. The deck spot-faced version is prepped for direct mounting to the airboat s deck without additional machining, saving time and labor.

4. **Availability of Parts and Support**

Lycoming engines, though no longer produced by Lycoming Engines (now part of Textron Aviation), still have a vast aftermarket support system. Parts like pistons, rings, crankshafts, and timing components are widely available from manufacturers like **Lycoming Engines (via distributors), Summit Racing, Airboat Parts, and eBay**. The engine s popularity in airboat circles ensures that mechanics and tuners are familiar with its quirks and maintenance needs.

5. **Modification Potential**

- **Forced induction (turbocharging or supercharging)**: While not as common as in automotive applications, some airboat owners have successfully added turbochargers to boost power. However, this requires careful tuning to avoid overheating or detonation.

- **High-performance camshafts and valves**: Upgrading to aftermarket cams or larger valves can improve airflow and horsepower.

- **Fuel system upgrades**: Swapping to a fuel injection system (e.g., **EFI by Airboat Parts or custom setups**) can improve throttle response and efficiency.

- **Cylinder head work**: Porting and polishing heads can enhance performance, though this is more labor-intensive.

6. **Lower Cost Compared to Modern Alternatives**

While not cheap, the O-320-A is significantly less expensive than newer airboat engines like the **Mercury Verado V8** or **Yamaha F150**. A used O-320-A in good condition can be found for **$3,000 $7,000**, depending on its condition and modifications. This makes it an attractive option for budget-conscious builders or those repairing older airboats.

7. **Community and Knowledge Base**

The airboat community is tight-knit, with forums (e.g., **Airboat Forum, Facebook groups**) where owners share tips, modifications, and troubleshooting advice. This makes it easier to find help when issues arise, whether it s tuning, mechanical problems, or installation tips.

8. **Versatility**

Beyond airboats, the O-320-A can be adapted for other applications like **utility boats, snowmobiles (with conversion kits), or even small aircraft** (though aviation use requires strict compliance with FAA regulations). This versatility adds value if you might repurpose the engine later.

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### **Cons of Buying a Lycoming O-320-A Deck Spot-Faced Barrel Airboat Engine**

1. **Age and Wear**

The O-320-A is a **1960s-era design** (originally introduced in the 1950s), and while it s robust, it is not immune to wear. Common issues include:

- **Crankshaft and main bearings**: Older engines may have worn bearings, leading to oil consumption or metal-on-metal contact.

- **Rod bearings**: These can wear out, causing knocking or catastrophic failure if not addressed.

- **Cylinder wear**: Over time, cylinders can become oval or develop scoring, reducing compression and performance.

- **Valvetrain wear**: Valves, springs, and lifters can stretch or wear, leading to poor valve sealing or excessive noise.

A **comprehensive inspection** (including compression test, leak-down test, and bore inspection) is critical before purchase.

2. **Maintenance Requirements**

- **Oil changes every 25 50 hours** (or as recommended by the owner s manual) with high-quality oil (e.g., **SAE 20W-50 or 30W-50**).

- **Timing belt inspection/replacement every 500 1,000 hours** (critical; a broken timing belt can destroy the engine).

- **Valve adjustment every 100 200 hours** (to prevent excessive valve float or noise).

- **Cylinder head torque checks** (heads can crack if overtightened).

- **Fuel system cleaning** (carbs or EFI systems can clog with ethanol or debris).

Neglecting maintenance can lead to **expensive repairs** or engine failure.

3. **Fuel and Ignition System Limitations**

- **Carbureted models**: The stock carburetor (if still present) may struggle with modern fuel blends (e.g., E10 or higher ethanol content), leading to rough idling or poor performance. Upgrading to a **Holley or Edelbrock carb** or switching to EFI is often necessary.

- **Ignition issues**: Points and distributors (if still used) can misfire or fail. Modern ignition systems (e.g., **MSD or Airboat Parts EFI kits**) are often required for reliability.

4. **Weight and Size**

The O-320-A is **heavy** (around **300 350 lbs dry**), which can be a challenge for smaller airboats or those with limited deck space. The barrel design helps, but it s still bulkier than some modern outboard motors.

5. **Emissions and Environmental Concerns**

- The O-320-A is **not EPA-certified** for modern emissions standards, which can be an issue if used in areas with strict regulations (e.g., some national parks or state waters).

- Running the engine without proper air filtration or fuel system upgrades can lead to **poor performance and increased emissions**.

6. **Limited Warranty or No Warranty**

Since Lycoming Engines no longer supports the O-320-A, **there is no manufacturer warranty**. Any issues after purchase are the buyer s responsibility. Buying from a reputable seller with a **service history** is essential.

7. **Learning Curve for Modifications**

While the O-320-A is modifiable, some upgrades (e.g., **turbocharging, custom fuel systems**) require **mechanical skill and experience**. Poorly executed modifications can lead to **engine damage or reduced reliability**.

8. **Resale Value**

The O-320-A holds its value reasonably well in the airboat community, but it s not a high-demand engine outside of niche applications. If you plan to sell it later, you may not recoup the full purchase price unless it s in excellent condition.

9. **Noise and Vibration**

The O-320-A is **loud and vibration-heavy**, especially at high RPMs. This can be uncomfortable for the operator and may require **engine mounts or vibration dampeners** for smooth operation.

10. **Fuel Consumption**

The O-320-A is **thirsty**, consuming around **1 1.5 gallons per hour** at full throttle. This can add up quickly, especially for long trips or frequent use.

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### **Conclusion**

The Lycoming O-320-A deck spot-faced barrel airboat engine is a **powerful, reliable, and modifiable** choice for airboat enthusiasts, particularly those working with larger or high-performance boats. Its **proven durability, high horsepower, and airboat-specific design** make it a favorite in the community. However, it comes with **significant maintenance requirements, age-related wear risks, and a lack of modern support**, which can be costly if not addressed properly.

- **Experienced airboat builders or restorers** who can handle maintenance and modifications.

- **Owners who prioritize power and performance** over modern convenience.

- **Budget-conscious buyers** who can afford the upfront cost and long-term upkeep.

- **Those who plan to keep the engine long-term** and are

Details:

LYCOMING 0-320-A NARROW DECK SPOT FACED FRESH CHROME BARREL AIRBOAT GROUND USE, CYLINDER HAS BEEN OVERHAULED WITH COMES VALVE TRAIN AND RING SET REASON THESE ARE.

part #: 68989 price

• $525.00

specifications engineaviatio:

• brand: Lycoming
• mpn: 68989
• part type: Deck
• country of origin: United States

shipping engineaviatio:

• type: Calculated
• transit: 5-8 Days
• service: UPS Ground
• class: Standard
• carrier: UPS
• cost: $49.88

returns engineaviatio:

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

seller engineaviatio:

• # reviews: 727
• rating: 100.0%
• city: El Reno, Oklahoma

offer engineaviatio:

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

payments engineaviatio:

• other
• credit card: Diners-club
• wallet: Apple-pay
• cash

general engineaviatio:

• Aviation Parts Accessories > Engines > Engine Components
• condition: Remanufactured

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