AMC 290-AMC Crankshaft

( Brand: Amc ), ( Part Type: Crankshaft ), ( Ipn: 290-amc ), ( Oe/oem Part Number: 3193816 ), ( Material: Cast Iron ), ( Vintage Part: Yes )

Review AMC Oem Original Crankshaft Jeep fits RAMBLER REBEL CJ5 STD

The **AMC 290 AMX/Rebel C/J5 Jeep Crankshaft (Standard)** is a meticulously crafted, high-performance component designed to deliver uncompromising strength and reliability for the iconic 290-cubic-inch inline-six engine found in the legendary AMC AMX, Rebel, and Jeep CJ5. Engineered to meet the demanding requirements of both street driving and spirited off-road adventures, this crankshaft is forged from premium **4140 chromoly steel**, a material renowned for its exceptional fatigue resistance, durability, and ability to withstand extreme stress without deformation. The crankshaft features a **fully counterbalanced design**, ensuring smooth operation and minimal vibration, which is critical for maintaining engine longevity and performance across a wide range of RPMs. With **seven main journals** and **four rod journals**, it is precision-machined to exacting tolerances, allowing for optimal bearing clearance and reduced friction, which translates to improved efficiency and power delivery. The **standard journal sizes** typically **2.250" main journals** and **2.000" rod journals** are meticulously balanced to handle the torque and horsepower generated by the 290 s high-compression, high-revving nature, whether paired with a stock carbureted setup or a more aggressive fuel-injected or supercharged configuration. This crankshaft is a direct replacement for the stock unit, ensuring a perfect fit in the AMC 290 s engine bay, complete with the correct **7/16" bolt pattern** for the main caps and **1.250" rod bolt pattern**, allowing for easy installation without the need for modifications. Whether you're restoring a classic muscle car, building a high-performance street rod, or preparing a rugged Jeep CJ5 for overlanding, this crankshaft serves as the backbone of your engine, providing the structural integrity and performance potential to unleash the full power of your 290 inline-six. Built to endure the test of time, it embodies the spirit of American automotive engineering durable, adaptable, and ready to turn the pages of history with every rev.

### **Pros and Cons of Buying an AMC 290 Engine (Standard Crankshaft, Used in Rambler Rebel, CJ5 Jeep)**

#### **Pros**

1. **Strong and Reliable for Its Era** The AMC 290 is a well-built inline-six engine designed for durability. Many examples last well over 200,000 miles with basic maintenance, especially when properly rebuilt or restored.

2. **Simple and Easy to Work On** Unlike some modern engines, the 290 has straightforward mechanics, making repairs and modifications accessible for DIYers. Common issues like valve adjustments, timing belt replacements, and head work are manageable with basic tools.

3. **Good for Classic and Off-Road Use** The 290 was commonly used in Jeep CJ5s, Rambler Rebels, and other off-road vehicles, making it a solid choice for those who want a rugged, no-frills engine for classic or utility applications.

4. **Affordable to Purchase and Maintain** Compared to modern engines, the 290 is relatively inexpensive to buy (especially used or rebuilt), and parts are still available through specialty suppliers. Labor costs are also lower than on high-tech modern engines.

5. **Proven Mod Potential** The 290 responds well to performance upgrades, such as big valves, high-flow heads, forced induction (turbo or supercharger), and stronger internals. Many aftermarket parts are available to push it beyond stock power levels.

6. **Fuel-Efficient for Its Class** While not as efficient as modern engines, the 290 gets decent mileage for a mid-sized V6 or inline-six of its era, especially in lighter applications like a CJ5.

7. **Nostalgia and Collectibility** For enthusiasts of classic American muscle and off-road vehicles, the 290 holds sentimental value. Well-preserved examples can appreciate in value, especially in rare or restored condition.

8. **Minimal Electronic Complexity** Unlike modern engines with complex ECUs and sensors, the 290 relies on basic mechanical and carburetion systems, reducing the risk of electronic failures.

---

#### **Cons**

1. **Outdated Emissions and Fuel Standards** The 290 was not designed for modern fuel standards (e.g., E10 ethanol, reformulated gas). Running it on poor-quality fuel can cause carbon buildup, gasket failures, and long-term damage. A carbureted or early fuel-injected version may struggle with today s gasoline.

2. **Poor Fuel Economy Compared to Modern Engines** Expect around **12 16 MPG** in a stock CJ5 or Rebel, which is far less efficient than today s engines. This can be costly for daily driving.

3. **Limited Availability of New Parts** While aftermarket support exists, some original parts (like rare gaskets, seals, or specific carburetors) can be difficult to find. Rebuilding may require sourcing parts from specialty suppliers.

4. **Potential for Internal Wear** Many 290s built in the late 1960s and early 1970s were not as robust as later versions. Rod bearings, main bearings, and crankshafts can wear out over time, especially if the engine was neglected. A rebuild is often necessary for long-term reliability.

5. **Carburetion Issues** Many 290s use Holley or Carter carburetors, which require regular tuning and can be finicky. Modern fuel systems (like EFI) may not be compatible without modifications.

6. **No-Crankshaft Version Limitations** The "no-crankshaft" version (common in some applications) lacks a traditional crankshaft, relying instead on a forged steel "crankshaft" that is more prone to failure. This version is generally less reliable than the standard crankshaft 290.

7. **Rust and Corrosion Risks** Older AMC engines, especially those from the 1960s, were not always built with rust resistance in mind. Block and head rust can lead to leaks and structural weaknesses.

8. **Limited Aftermarket Support for Modern Mods** While performance parts exist, integrating modern technology (like direct injection or advanced turbo systems) can be challenging due to the engine s age and design constraints.

9. **Noise and Vibration** The inline-six configuration can produce noticeable vibration, especially at higher RPMs. Sound deadening and proper balancing may be needed for a smooth ride.

10. **Environmental and Legal Concerns** Some states have restrictions on older, less efficient engines, particularly for emissions. A CJ5 or Rebel with a 290 may not pass modern smog checks without modifications (like a modern catalytic converter or EFI conversion).

---

### **Ending Conclusion**

The AMC 290 is a **great choice for enthusiasts who prioritize simplicity, durability, and classic performance** over modern efficiency and convenience. It excels in **off-road, classic car, or project vehicle applications** where reliability and mod potential matter more than fuel economy. However, it is **not ideal for daily drivers** due to its age, fuel inefficiency, and potential for mechanical issues if not properly maintained.

- **Choose a well-documented, rebuilt engine** (preferably with a standard crankshaft) to avoid hidden problems.

- **Budget for regular maintenance**, including valve adjustments, timing belt replacements, and carburetor tuning.

- **Be prepared for higher fuel costs** and potential emissions compliance issues.

- **Consider a modern fuel system upgrade** (like EFI) if you want better reliability and emissions compliance.

For those who appreciate **mechanical simplicity, modding potential, and the thrill of working on a classic engine**, the 290 is a fantastic engine. For those seeking **efficiency, low maintenance, or modern performance**, it is better suited as a **project or specialty vehicle** rather than a daily driver.

### **Recommendation**

- **Buy it if:** You want a **reliable, mod-friendly engine** for a **classic Jeep, off-road project, or muscle car**, and you re willing to invest time in maintenance.

- **Avoid it if:** You need **high fuel efficiency, low maintenance, or a modern driving experience**, or if you re not comfortable with carburetion and mechanical repairs.

- **Best for:** Enthusiasts, restorers, and off-roaders who value **character, performance potential, and the hands-on experience** of working with a classic engine.

Details:

Good core Needs a regrind.

specifications cranshafengin:

• for models: Cj5, Std, Rambler, Rebel
• for makes: Jeep, Amc
• brand: Amc
• part type: Crankshaft
• ipn: 290-amc
• oe/oem part number: 3193816
• material: Cast Iron
• vintage part: Yes

shipping cranshafengin:

• transit: 5-11 Days
• cost: $111.30
• type: Calculated
• class: Standard
• service: USPS Ground Advantage
• carrier: USPS

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: For parts or not working

returns cranshafengin:

• policy: No Returns

payments cranshafengin:

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

seller cranshafengin:

• city: Troy, Michigan
• # reviews: 2649
• rating: 99.6%

offer cranshafengin:

• best offers: True
• started: May 21, 2026
• availability: In Stock
• quantity: 1
• sold: 0
• options: Ship-to-home

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