MITSUBISHI 306-58988B Cylinder Head 2.4L

( Part Type: Cylinder Head ), ( Conditions Options: 2.4 ), ( Genuine Oem: Yes ), ( Ipn: 306-58988b ), ( Year: 2002 )

Review MITSUBISHI Cylinder Head 2.4l fits ECLIPSE 2000–2005

The **Mitsubishi 306-58988B cylinder head** is a critical and highly specialized component designed specifically for the **2.4L 4G94 16-valve inline-four engine** found in **Mitsubishi Eclipse models from the years 2000 through 2005**. This forged aluminum head is engineered to house the engine s high-performance valve train, featuring a **DOHC (Dual Overhead Camshaft) design** with **four valves per cylinder** two intake and two exhaust to optimize airflow and combustion efficiency. The head incorporates **precision-machined combustion chambers** and **integrated valve guides**, ensuring proper sealing and cooling for both the intake and exhaust valves, which are operated by **hydraulic lifters** and driven by the engine s camshafts. The **306-58988B** designation indicates a **direct replacement part**, meticulously crafted to match the original equipment specifications, including the **threaded spark plug holes, exhaust port contours, and camshaft bearing surfaces**, all of which contribute to the engine s smooth operation and power delivery. This cylinder head is particularly sought after for its **durability and compatibility** with both stock and modified applications, making it an essential upgrade for enthusiasts looking to restore or enhance the performance of their Eclipse s 2.4L engine. Whether used in a **rebuild, replacement, or performance tuning project**, this head ensures proper sealing, efficient cooling, and reliable valve operation, helping to maintain the engine s integrity and longevity.

**Pros and Cons of Buying a Mitsubishi 306-58988B Cylinder Head (2.4L 00-05 Eclipse)**

1. **Common and Widely Available** The 2.4L 4G93 engine (used in the 2000-2005 Eclipse) is a popular platform, meaning parts like cylinder heads are frequently stocked by aftermarket suppliers and salvage yards. This makes sourcing relatively easy compared to rarer engine components.

2. **Aftermarket Support** The engine has a strong aftermarket presence, with options for upgrades (e.g., porting, valve springs, or performance camshafts) and remanufactured heads available from companies like **JE, Crane Cams, or Summit Racing**. This allows for customization if you plan to modify the engine.

3. **Repairable and Rebuildable** The 4G93 is a relatively straightforward engine design, with common issues (like head gasket leaks or valve train wear) that can be addressed with proper maintenance. Many mechanics and DIYers have experience working on it.

4. **Potential for Performance Gains** With the right modifications (e.g., upgraded intake, exhaust, or a performance cam), the 2.4L can produce decent power gains, making it a viable option for enthusiasts looking to enhance stock performance without a full engine swap.

5. **Cost-Effective Replacement** Compared to OEM heads (which can be expensive or hard to find), aftermarket or used remanufactured heads are often significantly cheaper. A quality used head in good condition can be had for a fraction of the price of a new OEM part.

6. **Compatibility with Other Applications** The 306-58988B head is also used in other Mitsubishi models (e.g., Galant, Lancer, and some Dodge Stratus/Saturns), expanding your sourcing options.

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- **Head Gasket Failures** The stock head gaskets are prone to leaking, especially under high heat or with improper torque. This can lead to coolant mixing with oil or combustion gases, causing catastrophic failure if ignored.

- **Valve Train Wear** The stock valve springs and retainers can wear out over time, leading to valve float at higher RPMs. This is a common issue in high-mileage examples.

- **Oil Leaks** The valve cover gasket and oil filter housing gasket are notorious for leaking, requiring frequent replacements.

- **Rod Bearing Wear** Some engines develop rod bearing issues, which can lead to catastrophic engine failure if not addressed early.

2. **Age and Wear on Used Parts** If purchasing a used head, there s a risk of hidden damage (e.g., cracked combustion chambers, warped decks, or worn valve seats). Without a thorough inspection or machining, these issues can go unnoticed until the engine is reassembled.

3. **Limited Longevity Without Maintenance** The 4G93 is not built for extreme longevity without regular upkeep. Neglecting oil changes, timing belt replacements (every 60K 100K miles), or ignoring warning signs (e.g., coolant leaks, unusual noises) can lead to expensive repairs.

4. **Remanufacturing Quality Varies** Some remanufactured heads may not be as durable as OEM parts, especially if they come from lesser-known suppliers. Cheap or poorly rebuilt heads can fail prematurely, especially under high-performance conditions.

5. **Potential for Hidden Damage** If the head was previously damaged (e.g., from overheating, detonation, or improper machining), it may require additional work (e.g., decking, porting, or valve job) to restore proper function. This adds unexpected labor and material costs.

6. **Market Saturation** Due to the engine s popularity, the market is flooded with used parts, which can drive prices down but it also means lower-quality or salvaged parts may be more prevalent, increasing the risk of buying a lemon.

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The **Mitsubishi 306-58988B cylinder head (2.4L 00-05 Eclipse)** is a practical and cost-effective choice for those working on a 4G93 engine, provided you approach the purchase with caution. It offers **good availability, aftermarket support, and potential for upgrades**, making it a viable option for both stock and modified applications. However, the **engine s known weaknesses (head gaskets, valve train, leaks) and the risk of hidden damage in used parts** mean you must prioritize **thorough inspection, proper machining, and maintenance** to ensure reliability.

If you re rebuilding an engine, **prioritize a head from a reputable remanufacturer or a high-mileage used head that has been professionally inspected or machined**. Pair it with **upgraded valve springs, a performance cam, and a high-quality head gasket kit** to mitigate common failure points. For a stock replacement, a **used head in good condition with no signs of cracking or warping** can be a solid budget-friendly choice.

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- Opt for a **remanufactured head from a trusted supplier** (e.g., **JE, Crane Cams, or Summit Racing**) that includes a warranty. These are often more reliable than generic aftermarket parts.

- Ensure the head is **decked, ported, and polished** if you plan to modify the engine for performance.

- **Inspect for cracks, warping, or signs of overheating** (e.g., discoloration, pitting). A **CMM (Coordinate Measuring Machine) check** is ideal to verify deck flatness.

- **Test the head for leaks** by pressurizing it with compressed air (submerged in water) to check for cracks or porosity.

- **Consider machining** (decking, valve job, or porting) if the head has significant wear, especially if you re building a high-performance engine.

- Replace **stock valve springs and retainers** with aftermarket options (e.g., **Crane or Tokico**) to prevent valve float.

- Use a **high-quality head gasket kit** (e.g., **Fel-Pro or Fel-Pro Pro Seal**) and ensure proper torque specifications are followed.

- If modifying, consider a **performance camshaft** (e.g., **Crane or JE**) and upgraded intake/exhaust to complement the head.

- A **new remanufactured head** can cost **$200 $400**, while a **used head in good condition** may range from **$100 $250**. Factor in **machining costs** if needed.

- **Labor costs** for installation (especially if decking or porting is required) should be accounted for, as this can add **$100 $300 ** depending on the shop.

- After installation, **monitor for leaks, unusual noises, or overheating** especially in the first 1,000 2,000 miles.

- **Follow a strict maintenance schedule**, including **regular oil changes, timing belt replacements, and coolant system checks**.

The **306-58988B head is a sound choice for a 2.4L 4G93 rebuild**, but its success depends on **proper sourcing, inspection, and supporting modifications**. For best results, **combine it with upgraded components and diligent maintenance** to avoid the engine s common pitfalls. If you re unsure about the condition of a used head, **invest in professional machining or a new remanufactured unit** to ensure long-term reliability.

Details:

The part is not a special order. 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. Brokered/non-stocked parts ordered specifically for your request.

Bumper assemblies DO NOT come with Upper Grilles unless stated. No expedited shipping is available. Bolt-on items Scope: This limited warranty covers defects in the purchased part that render it inoperable or defective within 90-day period.

Sensors, valve covers, timing covers attached to core short/long blocks are not covered. Any bulbs or wiring still attached to the,Tail Light,assemblies are not warranted part of the listing in any way. Check the Q A section for Business Support.

Steering Columns: All steering columns sold will come without airbags. 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. Axles Assemblies: Axle assemblies will not include any brake hardware: Calipers/Rotors/Shoes/Pads/Hoses/Brake Lines. Transmissions: Transmissions will come with the torque converter and all sensors.

Please remember you are purchasing OEM Original Equipment Manufacturer USED parts. All parts sold as is except expressly provided below. Exclusions from Limited Warranty.

Limited Warranty Coverage. The part has not been altered, modified, disassembled, overheated or damaged. The part has not been installed. Dispute Resolution.

Normal wear and tear from the previous use is expected.

part #: 306-58988b price

• $100.00

specifications cylinderheapar:

• for models: Eclipse
• for makes: Mitsubishi
• for years: 2000-2005
• part type: Cylinder Head
• conditions options: 2.4
• genuine oem: Yes
• ipn: 306-58988b
• year: 2002

payments cylinderheapar:

• other
• wallet: Google-pay
• credit card: Discover

seller cylinderheapar:

• city: Annandale, Minnesota
• rating: 99.6%
• # reviews: 43344

returns cylinderheapar:

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

shipping cylinderheapar:

• cost: $65.00
• service: Standard
• class: Standard
• type: Fixed
• transit: 2-5 Days

general cylinderheapar:

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

offer cylinderheapar:

• started: February 18, 2026
• sold: 0
• quantity: 1
• availability: In Stock
• options: Ship-to-home

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