The Honda 12251-Z2E-003 Cylinder Head Gasket is a genuine OEM component designed for GX440 horizontal shaft engines. As a direct Honda OEM part, it is manufactured to the exact specifications required to seal the cylinder head on GX440 engines — ensuring that combustion pressure, coolant passages, and oil galleries are properly sealed without leaks. If your engine is showing signs of a blown head gasket — such as compression loss, oil or coolant seeping from the head joint, or white exhaust smoke — replacing this gasket with the correct OEM part is the right call. Confirm your engine's serial number against the fitment table before ordering to ensure this is the correct part for your specific unit.
Key Features
- OEM Sealing Integrity — engineered to Honda's exact specifications for the GX440, delivering the correct clamping retention and combustion-chamber seal that aftermarket alternatives may not replicate
- Direct OEM Replacement — sourced directly from Honda, this gasket installs in place of the original with no modification required to the head or block mating surfaces
- GX440 Fitment — designed specifically for the GX440 horizontal shaft engine; verify your engine's serial number against the compatibility table to confirm this is the right version for your unit
- Compression and Leak Control — a correctly seated cylinder head gasket maintains combustion pressure and prevents oil or exhaust gases from escaping the head joint, protecting engine output and longevity
The cylinder head gasket sits between the cylinder head and the engine block, forming a critical seal that holds combustion pressure inside the cylinder while keeping engine oil and any coolant passages from mixing or leaking externally. On GX440 engines, a failed or blown head gasket typically results in a noticeable loss of compression, external oil weeping at the head joint, or irregular exhaust output — all signs that the sealing layer has been compromised. Replacing the gasket with the correct Honda OEM part, part number 12251-Z2E-003, restores the tight seal the engine depends on for consistent power and clean operation.
Part Details
| Part Number | 12251-Z2E-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX440 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
