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481F-1003010BA
HongPro
481F-1003010BA
This professional-grade cylinder head, part number 481F-1003010BA, is engineered for superior performance and durability. Manufactured from high-strength aluminum alloy, it ensures optimal heat dissipation and structural integrity under extreme operating conditions. Precision-machined to OEM-equivalent tolerances, it guarantees a perfect fit and reliable compression sealing.
Rigorously tested for pressure integrity and dimensional accuracy, this component delivers a direct restoration of engine function. It is an ideal solution for engine rebuilds, offering a reliable and cost-effective alternative. By choosing this cylinder head, you are selecting a component built to meet rigorous quality standards, ensuring long-lasting performance and customer satisfaction
Our cylinder head is cast from a proprietary LM-8 aluminum alloy, known for its excellent strength-to-weight ratio. It undergoes a precise T6 heat treatment solution. This process involves solution heat treating at 535°C followed by artificial aging, which significantly enhances the material's hardness (reaching over 80 HB) and dimensional stability. This ensures superior resistance to thermal fatigue and warping, even under sustained high-temperature operation, for unparalleled long-term reliability.
Every 481F-1003010BA cylinder head is machined on CNC-controlled centers to exacting OEM specifications, with critical tolerance levels held within ±0.02mm. This guarantees a flawless fit with the engine block and valvetrain components. The camshaft bore and valve guide holes are precision-honed to ensure optimal oil retention and lubrication. This level of accuracy eliminates installation issues and ensures immediate, perfect engine function without the need for modifications or additional machining.
We implement a rigorous 100% quality control protocol. Every single unit undergoes a high-pressure air test, pressurized to 7 Bar for a minimum of 30 seconds, to detect any potential porosity or micro-fractures in the casting. This non-destructive test guarantees the integrity of the coolant and oil passages, preventing costly internal leaks and ensuring the component is ready for a trouble-free installation right out of the box.
The combustion chambers and intake/exhaust ports are designed using CFD (Computational Fluid Dynamics) analysis to mirror OEM performance. The surfaces are milled to a specific RA (Roughness Average) finish of under 3.2 µm, promoting better fuel-air mixture swirl and more efficient exhaust scavenging. This results in optimized combustion efficiency, which can contribute to restored engine power and stable performance, making it an ideal component for a professional-grade engine rebuild.
| Specification Category | Detailed Parameter | Standards & Notes |
| Core Part Number | 481F-1003010BA | OEM-Equivalent Replacement |
| Base Material | Aluminum Alloy LM-8 (Al-Si-Cu) | Conforms to ASTM B179 Standards |
| Heat Treatment | T6 Solution Heat Treated & Artificially Aged | Enhances tensile strength and hardness. |
| Surface Hardness | 80 - 85 HB (Brinell Hardness) | Ensures excellent wear resistance. |
| Combustion Chamber Volume | Consistent within ±0.5% of OEM specification | Guarantees correct compression ratio. |
| Head Gasket Surface Flatness | ≤ 0.05 mm across entire surface | Critical for perfect sealing, prevents leaks. |
| Valve Guide Bore Diameter | 7.000 - 7.015 mm | Precision honed for optimal valve alignment. |
| Camshaft Bore Diameter | As per OEM blueprint, tolerance: +0.02/-0.00 mm | Ensures precise camshaft fit and oil clearance. |
| Pressure Testing Standard | 100% Air Leak Test at 7 Bar (100 psi) for 30 seconds | Validates integrity of coolant and oil passages. |
| Surface Finish (Gasket Surface) | RA ≤ 3.2 µm (Micro-milled finish) | Optimized for superior gasket sealing. |
| Weight (Approx.) | As per OEM specification ±2% | Confirms structural integrity and material density. |
| Quality Certification | IATF 16949:2016 Manufacturing Process | Assures international automotive quality standards. |
Here are specific application scenarios of Cylinder Head:
Ideal for workshops performing comprehensive engine repairs where the original cylinder head is damaged beyond economic repair. Common causes include a cracked head from overheating or a warped sealing surface exceeding the 0.15mm maximum machining limit. This component provides a direct, zero-modification replacement that restores factory compression and valve timing, saving critical labor time compared to repairing a faulty original part.
Specifically designed to resolve failures indicated by persistent coolant loss, milky oil, or compression leaks into the cooling system. Our cylinder head's pressure-tested integrity (verified at 7 Bar) ensures it will not succumb to the thermal stress that damaged the original. It provides a permanent solution for engines suffering from recurring overheating issues once the root cause is corrected.
For engines with significant mileage, often exceeding 150,000 km, that exhibit symptoms of power loss, excessive oil consumption through valve guides, or compromised sealing. This unit replaces the worn original, which may have stretched valve seats and guides, restoring optimal combustion chamber seal, engine compression, and overall drivability to like-new conditions.
The definitive solution for irreversible physical damage to the original head, such as a severely cracked combustion chamber, broken camshaft caps, or damaged threads in spark plug or injector ports. As a fully assembled and machined unit, it eliminates the need and cost of sourcing and machining a used core, providing a guaranteed, ready-to-install solution.
To ensure optimal performance, we recommend a professional installation. Begin by thoroughly cleaning the engine block surface to a smooth, debris-free finish. Pre-lube the camshafts and rocker arms before assembly. Use a calibrated torque wrench to tighten the cylinder head bolts in the correct sequence and to the specified torque value, typically applied in three progressive stages (e.g., 50 N.m, 90 N.m, then a final angular turn). Always replace the head bolts and gasket with new ones to guarantee a perfect seal and prevent leaks.
