SUBARU 11095AA041 Head Bolts Set EJ20 11095AA042

( Manufacturer Part Number: 11095AA041 ), ( Part Type: Head Bolt ), ( Items Included: Bolts )

Review SUBARU Head Bolts Set Of Oem #11095aa042 fits IMPREZA EJ25 WRX STI 1995–2012

The **Subaru 11095AA041 (1995 2011 Impreza WRX STI EJ20/EJ25) Head Bolt Set (12-piece, including 11095AA042)** is a precision-engineered replacement part designed specifically for the high-performance, turbocharged engines found in Subaru s legendary WRX STI models. These bolts are critical components of the cylinder head assembly, ensuring proper clamping force, sealing integrity, and long-term reliability under the extreme stress of forced induction and high-performance driving. Crafted from high-strength, heat-treated steel, these bolts are engineered to withstand the intense thermal cycling and torque demands of the EJ20 and EJ25 engines, which are renowned for their aggressive tuning potential and racing pedigree. The set includes a mix of **12mm and 10mm bolts**, each meticulously machined to Subaru s original specifications, including the critical **11095AA042** a slightly longer bolt often required for proper head alignment and torque distribution in aftermarket builds. Whether you're restoring a classic STI, upgrading a stock engine, or preparing for track use, these bolts provide the structural integrity needed to prevent head warping, gasket leaks, or catastrophic failure under heavy loads. Their compatibility with both the naturally aspirated and turbocharged variants of the EJ series ensures they fit seamlessly into stock applications as well as heavily modified setups, making them an essential upgrade for enthusiasts seeking durability and performance. Proper installation with the correct torque sequence and specifications is recommended to maximize their effectiveness and extend the lifespan of your engine s critical components.

### **Pros and Cons of buying a Subaru 11095AA041 (1995-2011 Impreza WRX STI EJ20/EJ25 Head Bolts Set Includes 12 Bolts, Part 11095AA042)**

1. **Direct Fitment for Common Subaru Models** This bolt set is designed specifically for the EJ20 and EJ25 engines found in the 1995 2011 WRX STI and related models (e.g., 2001 2005 Impreza WRX, 2006 2011 WRX STI). It ensures compatibility without the need for adapters or modifications.

2. **High-Strength Material** Subaru head bolts are typically made from high-grade steel or alloy, capable of handling the torque and stress of a turbocharged engine. This reduces the risk of bolt stretch or failure under high loads.

3. **Pre-Lubricated or Genuine Quality** Many aftermarket bolt sets come pre-lubricated with anti-seize compound, which helps prevent galling and ensures easier installation. Genuine Subaru bolts are also known for their reliability, though aftermarket versions can be equally good if sourced from reputable brands.

4. **Prevents Common Issues** Loose or stripped head bolts can lead to catastrophic engine failure (e.g., blown head gasket, cracked cylinder head). Replacing them with new bolts is a proactive measure to avoid costly repairs.

5. **Easy to Install** These bolts are standard in size and threading, making them straightforward to replace, especially if you have basic mechanical experience or access to a mechanic.

6. **Cost-Effective Maintenance** Compared to full engine rebuilds or head replacements, replacing head bolts is a relatively inexpensive preventive measure (typically under $100 for a full set).

7. **Improves Engine Reliability** Over time, bolts can stretch or corrode, compromising their grip. New bolts ensure a secure fit, reducing the risk of leaks or misfires.

8. **Warranty or Guarantee Coverage** Reputable sellers often provide warranties or guarantees, offering peace of mind in case of defects.

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1. **Potential for Counterfeit or Low-Quality Parts** If purchasing from an untrusted source (e.g., unregulated online marketplaces), there s a risk of receiving fake or substandard bolts that may fail prematurely. Always buy from verified sellers (e.g., RockAuto, Summit Racing, or authorized Subaru parts dealers).

2. **Torque Specifications Must Be Followed** Over-tightening or under-tightening head bolts can cause warping, leaks, or bolt failure. Improper installation negates the benefits of new bolts. Always use a torque wrench and follow the manufacturer s specs (typically **80 90 ft-lbs for EJ20/EJ25**, in stages).

3. **Time-Consuming Installation** Removing and replacing head bolts requires removing the engine cover, cylinder head, and other components. This is a labor-intensive job, especially for inexperienced DIYers. Professional installation may be necessary, adding to the cost.

4. **Risk of Cross-Threading or Damage** If the bolt holes are stripped or the threads are damaged, installation can be difficult, and the bolts may not seat properly. This could require additional work (e.g., re-tapping threads) before fitting new bolts.

5. **Not a Permanent Fix for Underlying Issues** If the engine has other problems (e.g., warped head, cracked block, or poor cooling), replacing bolts alone won t resolve them. A full engine inspection is recommended before proceeding.

6. **Limited Lifespan in Extreme Conditions** While high-quality, head bolts can still fail if subjected to extreme heat, vibration, or improper lubrication. Regular maintenance (e.g., checking torque periodically) is advised.

7. **Mixed Reviews on Aftermarket vs. OEM** Some owners report that aftermarket bolt sets (even from reputable brands) may not match the precision of genuine Subaru bolts. However, for most applications, the difference is negligible if installed correctly.

8. **Potential for Overkill on Well-Maintained Engines** If the engine has been properly maintained and the bolts show no signs of stretch or damage, replacing them may be unnecessary. However, in turbocharged engines, it s a common precautionary step.

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Replacing head bolts on a 1995 2011 WRX STI (EJ20/EJ25) is a **highly recommended preventive maintenance task**, especially for high-mileage or turbocharged engines. The benefits such as improved reliability, prevention of catastrophic failure, and peace of mind outweigh the minor drawbacks, provided the bolts are installed correctly and sourced from a trusted supplier.

The **11095AA041 set (with 12 bolts, including the 11095AA042 part)** is a direct-fit solution that aligns with Subaru s engineering standards. While aftermarket alternatives exist, opting for a **genuine or high-quality aftermarket set** (e.g., from **AC Delco, ATE, or Summit Racing**) ensures reliability. If in doubt, consult a mechanic familiar with Subaru engines to confirm fitment and installation requirements.

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1. **Purchase from a Reputable Source** Buy the bolts from **RockAuto, Summit Racing, or an authorized Subaru parts dealer** to avoid counterfeit or low-quality replacements. Verify the part number (11095AA041) matches your engine (EJ20/EJ25).

- Warped cylinder heads (use a straightedge and feeler gauge).

- Cracked heads or blocks (visual inspection or dye penetrant testing).

- Signs of bolt stretch (measure old bolts; stretched bolts will be longer than spec).

- Cooling system issues (leaks, thermostat problems).

3. **Follow Torque Specifications Precisely**

- **EJ20 (non-turbo):** 80 ft-lbs in stages (1/4 turn increments).

- **EJ25 (turbo):** 90 ft-lbs in stages.

- Use a **digital torque wrench** for accuracy. Do not exceed specs.

4. **Consider Professional Installation** If you lack experience with head bolt replacement, a **Subaru specialist or turbo shop** can ensure proper installation, reducing the risk of mistakes.

- Upgrading to **high-quality anti-seize compound** (e.g., **Permatex 2400**).

- Checking **spark plugs, ignition coils, and fuel injectors** for wear.

- Reviewing **cooling system health** (water pump, hoses, thermostat).

6. **Document the Work** Keep records of the replacement date and torque values for future reference.

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- Your WRX STI has high mileage or shows signs of bolt stretch.

- You re performing routine maintenance on a turbocharged EJ20/EJ25 engine.

- You want to prevent head gasket failure or catastrophic engine damage.

- You notice oil leaks around the head bolts.

- The engine has a history of overheating or misfires.

- The bolts appear stretched or corroded.

For most WRX STI owners, this is a **worthwhile investment** in long-term engine reliability. When combined with proper installation and maintenance, it significantly reduces the risk of expensive repairs.

Details:

Good condition head bolts. Offering them for cheap to help someone out.

part #: 11095aa041 prices

• $61.05-$72.62

specifications cylinderheapar:

• for models: Ej25, Wrx, Sti, Impreza
• for makes: Subaru
• for years: 1995-2012
• mpn: 11095aa041
• part type: Head Bolt
• items included: Bolts

shipping cylinderheapar:

• type: Calculated
• cost: $8.65
• transit: 6-10 Days
• carrier: USPS
• service: USPS Ground Advantage
• class: Standard

offer cylinderheapar:

• started: February 21, 2026
• options: Ship-to-home
• sold: 0
• quantity: 1
• availability: In Stock

seller cylinderheapar:

• city: Herndon, Virginia
• rating: 100.0%
• # reviews: 62

payments cylinderheapar:

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

general cylinderheapar:

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

returns cylinderheapar:

• policy: No Returns

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