1. Cylinder Heads & Parts Engines Components For Sale
  2. sku: 11807180011032741
  3. JEEP COMANCHE

JEEP 306-01394 Cylinder Head Comanche 6-242 4.0L

fits make: Jeep. year: 1988.

306-01394 Jeep Cylinder Head 6-242 4.0l Fits 1988 Comanche 1312756

( Model: COMANCHE ), ( Part Type: Cylinder Head ), ( Conditions Options: 4.0, Note ), ( Genuine Oem: Yes ), ( Ipn: 306-01394 )

Review JEEP Cylinder Head 4.0l Comanche fits 1988

The **Jeep 306-01394 Cylinder Head (6-242, 4.0L, 1988 Comanche)** is a meticulously engineered component designed to deliver peak performance and reliability for the iconic 4.0L AMC V8 engine found in the 1988 Jeep Comanche. This high-quality cylinder head is a direct-fit replacement, ensuring seamless integration with the original engine bay while maintaining the same robust construction and precision machining that Jeep drivers expect. Crafted from durable cast iron, this head is built to withstand the demands of high-performance driving, whether you're tackling rugged off-road trails or cruising on the highway. The design features a classic 6-bolt main pattern, which is both sturdy and easy to work with, allowing for straightforward installation and maintenance. The combustion chambers are precisely shaped to optimize fuel-air mixture and combustion efficiency, contributing to improved horsepower and torque output while minimizing emissions. Valve guides and seats are reinforced to ensure longevity and reduce the risk of wear, even under heavy loads. This cylinder head is fully compatible with the 6-242 intake manifold and exhaust system, making it an ideal choice for restorations, modifications, or routine engine overhauls. Whether you're restoring a classic Comanche to its original glory or upgrading an existing engine for enhanced performance, this cylinder head is a dependable and high-performance solution that embodies the rugged spirit of Jeep s legendary 4.0L V8.

Buying a used Jeep 306-01394 cylinder head for a 1988 Comanche 4.0L inline-six engine involves several considerations. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying This Cylinder Head**

1. **Compatibility and Fitment**

The 306-01394 is a standard cylinder head for the 4.0L AMC inline-six engine, which powers the 1988 Comanche. It is a direct replacement for the original head, ensuring proper fitment without modifications. This eliminates the need for custom machining or adapters.

2. **Common Availability**

As a widely used part in Jeep and AMC vehicles (including the Comanche, Cherokee, and Jeep Wagoneer), this cylinder head is relatively easy to source from used parts markets, salvage yards, or online marketplaces. This increases the likelihood of finding a suitable unit without excessive searching.

3. **Proven Reliability**

The 4.0L AMC engine is a robust design known for durability, especially when maintained properly. The 306-01394 head is part of this proven architecture, meaning it has been tested by many drivers over decades. If the head is in good condition, it can provide long-term service.

4. **Cost-Effectiveness**

Compared to buying a new or remanufactured head, a used unit is significantly cheaper. This makes it an attractive option for budget-conscious buyers who prioritize functionality over brand-new parts. Prices for used heads are typically in the range of $100 $300, depending on condition and location.

5. **Potential for Restoration**

If the head is worn or damaged, it can often be restored or rebuilt by a machinist. The design is straightforward, and common issues (such as valve seat wear or warping) can be addressed with relatively low-cost repairs. This extends the head s usable life.

6. **Community and Support**

The Jeep and AMC community is active, with forums (e.g., JeepForum, AMC Owners Club) where you can seek advice, verify part authenticity, or find recommendations for reputable sellers. This support system can help you avoid scams or poor-quality parts.

7. **No Major Modifications Needed**

Unlike some aftermarket or high-performance heads, this stock head does not require extensive modifications to fit or function. It can be installed with basic tools and knowledge, making it accessible to DIYers.

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### **Cons of Buying This Cylinder Head**

1. **Condition Uncertainty**

Since you re purchasing a used part, the condition of the cylinder head is unknown unless you inspect it thoroughly. Common issues to watch for include:

- **Warping**: Can cause poor sealing between the head and block, leading to leaks or poor compression.

- **Valve Seat Wear**: Causes oil burning, misfires, or excessive heat. Worn seats may require re-machining or replacement.

- **Cracking**: Stress cracks (especially around the valve guides or spark plug holes) can lead to coolant or oil leaks. These are often invisible until the head fails.

- **Worn Valves or Guides**: Can result in poor engine performance or excessive valve train noise.

- **Exhaust Port Erosion**: Common in high-mileage engines, this can reduce airflow and power.

- **Leaking Valve Cover Gasket or Head Gasket**: Signs of past neglect or improper installation.

Without a physical inspection or a trusted seller who provides documentation (e.g., rebuild records), you risk buying a head with hidden problems.

2. **Potential for Salvage or Rebuilt Quality**

Some used cylinder heads are sourced from salvage yards and may have been previously damaged or poorly repaired. Even if they ve been "rebuilt," the quality of the work can vary widely. Cheap rebuilds might use substandard materials or lack proper sealing surfaces, leading to future issues.

3. **Limited Performance Gains**

This is a stock cylinder head designed for stock performance. Unless you re restoring the engine to original specifications, it won t offer any significant power improvements over the original. If you re looking for performance upgrades, you d need to pair it with other modifications (e.g., headers, camshaft, or a high-flow intake) for noticeable results.

4. **Machining Costs**

If the head is worn, you ll likely need to have it machined (valve job, decking, or seat replacement). These services can add $100 $300 or more to the total cost, depending on the extent of the work. This reduces the initial cost savings of buying used.

5. **Risk of Compatibility Issues**

While the 306-01394 is standard for the 4.0L AMC engine, there are slight variations between years and applications. For example:

- Some early 1980s models had slightly different head designs (e.g., 306-01393 vs. 01394). Ensure the part number matches your engine s specifications exactly.

- Aftermarket or modified engines (e.g., with turbocharging or forced induction) may require different heads or additional modifications.

6. **Time and Effort Required**

Installing a cylinder head requires removing the engine from the vehicle (or at least the head itself), which is labor-intensive. If you re not experienced with engine work, this project can be time-consuming and frustrating. You may need to rent tools, purchase gaskets/sealants, and follow precise procedures to avoid leaks or damage.

7. **Potential for Counterfeit Parts**

The aftermarket for Jeep and AMC parts has seen an increase in counterfeit or low-quality replicas. These parts may look identical but fail prematurely or lack critical features (e.g., proper thread pitch, gasket surfaces). Always verify the part s authenticity through the seller s reputation, part numbers, or third-party verification.

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### **Conclusion**

Buying a used 306-01394 cylinder head for your 1988 Comanche 4.0L engine can be a cost-effective solution if you prioritize functionality and are willing to invest time in inspection or restoration. The part is widely available, compatible, and reliable when in good condition. However, the risks of hidden damage, poor rebuild quality, or compatibility issues cannot be ignored. The key to a successful purchase lies in thorough due diligence: inspecting the part (or having it inspected by a mechanic), verifying its history, and being prepared for potential machining or installation challenges.

If you re comfortable with engine work and can afford to budget for unexpected repairs, a used head is a viable option. For those less experienced or seeking a hassle-free solution, purchasing a remanufactured or new head (if available) may be worth the higher cost.

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### **Recommendation**

1. **Inspect the Head Thoroughly**

- Look for cracks (use a dye penetrant or magnetic particle inspection if possible).

- Check for warping by placing the head flat on a surface and measuring with a straightedge.

- Inspect valve seats, guides, and springs for wear or damage.

- Verify that all threads (spark plug holes, oil passages) are intact and free of debris.

2. **Buy from a Trusted Source**

- Prefer sellers with positive reviews, clear photos, or proof of condition (e.g., rebuild records).

- Consider purchasing from a reputable salvage yard or parts dealer that offers warranties or return policies.

- Avoid deals that seem too good to be true; used cylinder heads rarely sell for under $100 in good condition.

3. **Budget for Machining**

Allocate an additional $150 $400 for a valve job or decking if the head is worn. This ensures it will seal properly and function correctly.

4. **Consider a Remanufactured Option**

If available, a remanufactured 306-01394 head (from a company like **AMC Performance Parts** or **Jeep Parts Pro**) may offer better quality control and a warranty, justifying the higher cost.

5. **Document the Process**

Take photos before and after installation, and keep records of any work done (e.g., machining, gasket replacement). This helps with future troubleshooting or warranty claims.

6. **Prioritize Safety and Proper Installation**

- Use the correct gaskets (head gasket, valve cover gasket) and sealants.

- Follow torque specifications to avoid warping or leaks.

- Consider consulting a mechanic if you re unsure about any step.

**Final Verdict**: If you re confident in your ability to inspect and prepare the head, buying used is a practical choice. For those seeking peace of mind, a remanufactured head is the safer investment. Always weigh the cost of the part against the potential labor and repair costs to ensure it aligns with your project s budget and goals.

Details:

Steering Columns: All steering columns sold will come without airbags. Limited Warranty Coverage. Scope: This limited warranty covers defects in the purchased part that render it inoperable or defective within 90-day period. COMANCHE 87-90 6-242 4.0L.

Sensors, valve covers, timing covers attached to core short/long blocks are not covered. Check the Q A section for Business Support. Please remember you are purchasing OEM Original Equipment Manufacturer USED parts.

Exclusions from Limited Warranty. All parts sold as is except expressly provided below. Axles Assemblies: Axle assemblies will not include any brake hardware: Calipers/Rotors/Shoes/Pads/Hoses/Brake Lines. Bolt-on items.

No expedited shipping is available. The part has not been altered, modified, disassembled, overheated or damaged. Transmissions: Transmissions will come with the torque converter and all sensors.

Normal wear and tear from the previous use is expected. The part is not a special order. Any bulbs or wiring still attached to the,Tail Light,assemblies are not warranted part of the listing in any way. Brokered/non-stocked parts ordered specifically for your request.

Labor and Related Costs: This limited warranty does not cover labor, diagnostics, towing, rental car costs, or any other expenses related to the installation, testing, removal, replacement of a part. The part is not a custom body cut. The part has not been installed. Dispute Resolution.

Convenience Items: Items attached to or included with the part, such as wiring, bulbs, sockets, sensors, coils, distributor caps, spark plugs, water pumps, filters, brake parts, backing plates, hoses, vacuum lines, u-joints, timing belts/components, similar items, are considered convenience items and not covered by this limited warranty. Bumper assemblies DO NOT come with Upper Grilles unless stated.

part #: 306-01394 prices

  • $19.50-$125.00

specifications cylinderheapar:

  • for makes: Jeep
  • for years: 1988
  • model: Comanche
  • part type: Cylinder Head
  • conditions options: 4.0, Note
  • genuine oem: Yes
  • ipn: 306-01394

shipping cylinderheapar:

general cylinderheapar:

  • condition: Used
  • Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

payments cylinderheapar:

  • credit card: Mastercard
  • wallet: Apple-pay
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seller cylinderheapar:

  • city: Annandale, Minnesota
  • rating: 99.6%
  • # reviews: 44981

returns cylinderheapar:

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

offer cylinderheapar:

  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • started: March 29, 2026
  • sold: 0
for makes: jeep, for years: 1988, part type: cylinder head, conditions options: 4.0, note, genuine oem: yes,
manufacturer: jeep, category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, sku: 11807180011032741,
Jeep 6-242 Is Similar To:
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5 offers $19.50–$125.00 USD
  • Used. Offer #1 priced at $125.00 + $Calculated shipping estimate = $125.00* total. COMANCHE 87-90 (4.0L).+$Calculated shipping
  • Used. Offer #2 priced at $19.50 + $0.00 shipping estimate = $19.50* total. FREE SHIPPING
  • Used. Offer #3 priced at $55.39 + $29.99 shipping estimate = $85.38* total. Throttle Body 4.0L 6 Cylinder OEM With Warranty 1997 Jeep Wrangler Throttle Valve Assembly, c (4.0L).+$29.99 shipping
  • New. Offer #4 priced at $45.22 + $0.00 shipping estimate = $45.22* total. FREE SHIPPING
  • New. Offer #5 priced at $64.31 + $0.00 shipping estimate = $64.31* total. This part fits vehicles made in the following years 1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003.FREE SHIPPING

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