Custom cast iron engine block
Our custom cast iron engine blocks are precision sand-cast and fully CNC-machined for automotive, industrial, marine, and stationary engine applications. Manufactured from high-grade grey iron and compacted graphite iron, each block is machined to your exact drawing specifications, including cylinder bore diameter, bore spacing, deck height, crankshaft main journal bore, and coolant passage layout. We support OEM and ODM orders for both replacement engine blocks and new engine development programs, with full dimensional inspection and pressure testing available before mass production sign-off.
*Provide your application requirements—such as stress conditions, materials, size range, and even product name. We are always available for customization, so please contact us directly.
Introduction
Why Choose Our Cast Iron Engine Blocks?
Full CNC Machining on All Critical Surfaces — Cylinder bores, deck faces, main bearing saddles, camshaft bores, and oil gallery drillings are all CNC-machined to tight tolerances, ensuring precise component fit for pistons, crankshaft, camshaft, and cylinder head assemblies.
Cylinder Bore Honing to Specification — Each cylinder bore is finish-honed to your specified bore diameter and surface finish (Ra value), providing the correct oil retention pattern for piston ring seating and long-term sealing performance.
Grey Iron & Compacted Graphite Iron Options — Grey iron delivers proven vibration dampening, machinability, and cost efficiency for standard displacement engines, while compacted graphite iron (CGI) provides up to 75% higher tensile strength for high-performance, turbocharged, and high-compression engine applications.
Custom Displacement & Bore Spacing — Whether you are replicating an existing engine family or developing a new powerplant, we manufacture to your exact bore diameter, stroke, cylinder count, and bore spacing without compromise.
Pressure Testing & Leak Certification — Hydraulic pressure testing of coolant and oil passages is available on all blocks, with leak test certification provided for OEM engine assembly line qualification requirements.
Specifications
Category Specifications & Technical Details Product Name Custom cast iron engine block Scope of Services • Custom Casting & High-Precision CNC Machining (OEM/ODM)
• Prototyping & Full-Scale Mass Production
• Advanced Reverse Engineering for Discontinued Engines
• Thermal Stress Relief Heat Treatment
• Complex Core Manufacturing for Water/Oil JacketsMaterials • Grey Cast Iron (GG25, GG30 / HT250, HT300) – Excellent damping & thermal conductivity
• Ductile/Nodular Iron (GGG50, GGG60 / QT500, QT600) – Superior strength & fatigue resistance
• Alloy Cast Iron (Cr, Mo, Ni, Cu alloying) for high-performance applications
• Compacted Graphite Iron (CGI) for high-load diesel enginesMachining Processes • 4 & 5-Axis CNC Horizontal/Vertical Milling
• Precision Boring of Cylinder Liners & Main Bearing Caps
• High-Accuracy Honing for Cylinder Bores (Cross-hatch finish)
• Deep Hole Drilling for complex internal oil galleries
• Face Grinding & Lapping for cylinder head mating surfacesTarget Industries • Automotive & Light Commercial Vehicles
• Heavy-Duty Trucks & Buses
• Marine Engines & Naval Propulsion Systems
• Agricultural & Construction Heavy Equipment
• Stationary Power Generation & Industrial CompressorsSurface Treatment • Precision Sandblasting & Shot Peening
• Rust-Inhibitive Coating & Industrial Oiling
• High-Temperature Resistant Surface Painting
• Protective Wax Coating for International Shipping
• Phosphating for internal friction reductionInspection Facilities • Large-Scale CMM (Coordinate Measuring Machine) for geometric accuracy
• Hydrostatic & Pneumatic Pressure Testing (Leak detection for jackets)
• Ultrasonic & X-Ray Flaw Detection (Casting integrity check)
• Spectrometer for precise chemical composition analysis
• Profilometers for bore roughness and cylindricity testingOur Advantages 1. Superior Thermal Stability: Advanced heat treatment eliminates internal stresses to prevent warping.
2. Leak-Free Integrity: 100% pressure testing ensures zero porosity in complex water/oil channels.
3. Wear Resistance: Optimized material alloying ensures superior cylinder bore longevity.
4. Precision Engineering: Micrometer-level tolerances for critical bearing and head mating areas.
5. Integrated Support: End-to-end management from casting design to final finish-machining.
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Let’s talk about your next project !
I don't have complete drawings, can I send inquiry?
Yes, we can help you analyze based on your description, samples and photos.
I am not sure if you can do my parts?
Most of our customers come to us because “others say they can’t do it”.
Are you a factory or a trader?
We are a factory and have a project management team that can handle the technology, cost and delivery at the same time.
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