55565291 55573669 | New 1.4L DOHC Cylinder Head for Chevrolet Cruze, Trax, Sonic, Buick Encore – Heavy-Duty Aftermarket Casting

GM 1.4L Ecotec (Cruze/Sonic/Trax) New Heavy-Duty Cylinder Head

Reinforced Aftermarket Casting – Engineered to Eliminate Common Cracking Issues

Engineered for the high-thermal demands of the GM 1.4L DOHC Ecotec Turbo series, this brand-new, heavy-duty aftermarket cylinder head is the definitive upgrade for long-term engine reliability. Specifically designed to correct original factory casting vulnerabilities, this “reinvigorated” design features significantly thickened internal walls and reinforced coolant jackets in high-stress areas. These structural enhancements provide superior resistance to the thermal fatigue and micro-cracking common in high-heat, turbocharged environments.

Utilizing a premium high-density aluminum alloy, each cylinder head is precision-machined to meet or exceed original equipment (OE) dimensional tolerances, ensuring a superior head gasket seal and optimal volumetric efficiency. Unlike remanufactured units, this brand-new casting eliminates the risk of previous heat cycles, providing a “zero-hour” foundation for your top-end rebuild. Whether you are maintaining a Chevrolet Cruze, Sonic, Trax, or Buick Encore, this heavy-duty casting provides the structural integrity and improved cooling capacity required to sustain factory boost levels and regain peak fuel economy.

🛠️ In-House Machining Process

• Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils, metal shavings, and manufacturing debris. This ensures your oiling system remains uncontaminated from the first start-up.

• In-House Precision Machining: Unlike “shelf-stock” heads, we perform all final machine work in-house. This includes final guide sizing and precision valve seat cutting to ensure perfect geometry and clearances before the head reaches the assembly bench.

• Pressure & Integrity Testing: To go beyond the factory standard, we pressure-test every head to 60 PSI. This verifies that the casting is free of porosity leaks or internal defects that could compromise the cooling or oiling systems.

• Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface and bore alignment. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.

• Professional Assembly & Setup: Valvetrain components are installed and verified in a clean-room environment. We check spring heights and seal seating to ensure the assembly is balanced and ready for high-performance use.

• Vacuum-Seal Verification: Every intake and exhaust port is Vacuum Tested. This guarantees a 100% airtight seal between the valves and seats, ensuring maximum compression and peak performance right out of the box.

🛠️ Heavy-Duty Engineering & Features

• Reinforced Casting: Manufactured with a robust aftermarket design that is thicker than the OEM head to prevent thermal cracking.
• Premium Valvetrain: Equipped with 21-4N Stainless Steel valves, high-tension springs, and retainers for optimal combustion efficiency.
• Advanced Cooling: Integrated cooling channels are optimized for better heat dissipation and reduced thermal stress.
• High-Temp Seals: Includes premium temperature-resistant valve seals to prevent leaks and oil consumption.
• Ready to Install: Fully assembled and precision-machined for a direct bolt-on fit with no modifications required.

📊 Technical Specifications

• Engine Type: 1.4L DOHC Inline 4-Cylinder (Turbo)
• Casting Numbers: 55565291 | 55573669
• Material: High-Grade Aluminum with Reinforced Walls
• Configuration: 4 Valves Per Cylinder
• Condition: Brand New – Heavy-Duty Aftermarket
• Each Cylinder Head Includes: Valves and Springs Installed, Camshafts Installed, Rockers and Lifters Installed 

🚛 Fitment Data

Common Applications:

• Chevy Cruze: 2011–2016 (1.4L Turbo)
• Chevy Sonic: 2012–2020 (1.4L Turbo)
• Chevy Trax: 2013–2021 (1.4L Turbo)
• Buick Encore: 2013–2021 (1.4L Turbo)