fits model: Wrx, Sti, Std. make: Subaru. year: 2004.

( Brand: Manley ), ( Manufacturer Part Number: 612000C-4 )
Introducing the 612000c-4 Manley 04 Subaru WRX STI EJ257 Standard Cylinder Head, a high-performance upgrade for your Subaru's engine. This cylinder head is specifically designed for the 1999.5-2007 Subaru WRX STI, and it features a billet aluminum construction, ensuring durability and reliability under extreme driving conditions.
The 612000c-4 Manley cylinder head is equipped with a 99.5mm bore, which is larger than the original EJ257 cylinder head. This increase in bore size allows for more displacement, resulting in more power and torque. The cylinder head also features a 32-valve DOHC (double overhead camshaft) design, which provides optimal valve control for improved engine performance.
The 612000c-4 Manley cylinder head is also equipped with large, 3.00-inch intake and 2.25-inch exhaust valves, which allow for increased air and fuel flow. The valve seats are made of ceramic, which provides excellent heat resistance and durability. The cylinder head is also equipped with Manley's proprietary 2.35-inch intake and 1.65-inch exhaust valve springs, which provide excellent lift and control.
The 612000c-4 Manley cylinder head is also equipped with Manley's proprietary 7/16-inch steel intake and exhaust valve guides, which provide excellent guidance and support for the valves. The cylinder head is also equipped with Manley's proprietary 3/8-inch oil control rings, which help to reduce oil consumption and prevent oil from entering the combustion chamber.
The 612000c-4 Manley cylinder head is also equipped with Manley's proprietary 1.2mm intake and exhaust valve stem seals, which provide an excellent seal and prevent oil and coolant leakage. The cylinder head is also equipped with Manley's proprietary 0.080-inch head gasket, which provides an excellent seal and prevents oil and coolant leakage.
Overall, the 612000c-4 Manley 04 Subaru WRX STI EJ257 Standard Cylinder Head is a high-performance upgrade for your Subaru's engine. Its large bore size, 32-valve DOHC design, large valves, and ceramic valve seats provide excellent power and torque, while its 7/16-inch steel valve guides, 3/8-inch oil control rings, 1.2mm valve stem seals, and 0.080-inch head gasket provide excellent sealing and reliability. If you're looking to take your Subaru's performance to the next level, the 612000c-4 Manley cylinder head is a worthwhile investment.
Pros of buying a 612000c-4 Manley 04 Subaru WRX STI EJ257 standard 99.5mm engine:1. High-quality components: Manley is a well-known brand in the performance engine market, known for its high-quality products. This engine is expected to be durable and reliable.
2. Increased power and performance: The 612000c-4 engine is designed to provide more power and better performance than the stock EJ257 engine. This can result in improved acceleration, better handling, and a more enjoyable driving experience.
3. Customization options: The 612000c-4 engine is designed to be easily modified and upgraded, allowing you to fine-tune the engine to meet your specific needs and preferences.
4. Increased resale value: Installing a high-performance engine like the 612000c-4 can increase the resale value of your Subaru WRX STI, making it a worthwhile investment for those who plan to sell their car in the future.
Cons of buying a 612000c-4 Manley 04 Subaru WRX STI EJ257 standard 99.5mm engine:1. Cost: The 612000c-4 engine is a high-performance engine, and as such, it comes with a higher price tag than the stock EJ257 engine. This can be a significant investment, especially for those on a tight budget.
2. Installation complexity: Installing a high-performance engine like the 612000c-4 can be a complex and time-consuming process. It may require specialized tools and expertise, which can add to the overall cost of the project.
3. Potential for reduced fuel efficiency: High-performance engines like the 612000c-4 are designed to provide more power, but they may also consume more fuel than the stock EJ257 engine. This can result in higher fuel costs over time.
4. Potential for increased insurance premiums: Installing a high-performance engine like the 612000c-4 may result in higher insurance premiums, as the engine is more powerful and potentially more risky to insure than the stock EJ257 engine.
Conclusion:The 612000c-4 Manley 04 Subaru WRX STI EJ257 standard 99.5mm engine is a high-quality, high-performance engine that can provide increased power and performance for your Subaru WRX STI. However, it also comes with a higher cost, installation complexity, potential for reduced fuel efficiency, and increased insurance premiums. If you are willing to make the investment and are looking for a more powerful and performance-oriented driving experience, then the 612000c-4 engine may be a good option for you. But if you are on a tight budget or are looking for a more fuel-efficient and cost-effective engine, then the stock EJ257 engine may be a better choice. Ultimately, the decision to install a high-performance engine like the 612000c-4 should be based on your specific needs, preferences, and budget.
Manley Subaru EJ257 pistons now include Napier second rings and higher tension oil by total seal for superior control mildly boosted.
Recommended clearance. Manley 04 Subaru Wrx Sti EJ257 Std stroke 83mm strokes and 110compression ratio:8. 141engine:ej257face type:dish vehicle make::2618bore:99.
Offset wrist pin design is utilized for quiet start-ups. 0 note:std stroke rod length :5.
5mm 612000C-4 item specifics condition: new brand:Manley performance compression height : Each design is lightweight yet robust enough to deliver long service life for highly boosted measured. 209manufacturer part number:612000c-4 dish dome cc:-22. All pistons come with Molly coated skirts.