Description
This listing is for a remanufactured pair of cylinder heads designed for the 4.6 L 32-valve DOHC 4V V8 found in 2003–2004 Mustang Cobra / Mach 1 and other late-Modular applications. Heads are rebuilt to OEM-level standards — ideal for engine rebuilds, performance builds, or replacing damaged/warped heads. The 03–04 4V heads are celebrated for their flow capability and ability to support high power output, making them a top choice for performance-minded builders.
Rebuild Process & Quality Assurance
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Full Disassembly & Deep Cleaning — Every head is disassembled, cleaned, and inspected to remove carbon, sludge, and old gasket residue.
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Pressure Testing — Castings are checked for cracks or flaws to ensure structural integrity before reassembly.
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Valve Train Refresh — New valve stem seals installed; worn valve guides replaced as necessary. Valve seats corrected via multi-angle valve job for optimal sealing and airflow.
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Flow-Optimized Machining — Deck surfaces are milled precisely to ensure correct gasket sealing and flatness. Valve seats and ports are reconditioned to restore flow capacity.
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Final Assembly & Quality Inspection — All parts cleaned, checked, and reassembled to factory tolerances. Heads are delivered rebuild-complete and ready for installation.
Key Features & Benefits
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Condition: Remanufactured — fully refreshed for reliability and durability
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Designed for 4.6 L Modular 32-valve DOHC 4V V8 (03–04 Cobra / Mach 1)
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Includes both heads (driver + passenger) — complete set
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No Core Charge — keep your old heads, no return required
- Improved 9-thread inserts
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Flow-capable 4V heads — excellent for stock rebuilds or performance / forced induction builds that need strong airflow and head integrity
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Ready for installation — minimal prep required before bolt-on
Fitment / Applications
These heads fit 4.6 L Modular 32-valve DOHC 4V engines in 2003–2004 Mustang Cobra, Mach 1, and other compatible Ford Modular V8 applications using the “C-head / DA-suffix” casting.
Before ordering, verify:
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Your block & engine code are compatible with 4V Modular 4.6 L heads
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Bolt pattern and head-gasket surface match your engine block
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Intake, manifolds, and accessories align properly with 4V head geometry
Shipping & Handling
Shipped via standard carrier with tracking. Heads are securely packaged to protect machined surfaces, valve seats, and internal passages during shipping.
Fitment & Disclaimer
Buyer must verify compatibility before installation — including casting match, block, gasket, and port layout. Photos and measurement references are provided to assist with verification.
