The Honda 12251-ZF5-H03 Cylinder Head Gasket is a genuine OEM replacement designed for GXV390 vertical shaft engines. As a direct Honda OEM part, this gasket is manufactured to the exact specifications required for a proper head seal on the GXV390. Confirm your engine's serial number against the fitment table before ordering to ensure this is the correct part for your unit.
Key Features
- Correct Head Seal Integrity — a genuine OEM cylinder head gasket maintains the combustion chamber seal that an OEM-spec part is engineered to deliver, holding compression where an aftermarket or degraded gasket may not
- Direct OEM Replacement — manufactured by Honda to the exact dimensional and material specification of the original, this gasket drops into the GXV390 without alteration
- GXV390 Fitment — sourced specifically for GXV390 vertical shaft engines; verify your serial number against the fitment table, as Honda supersedes gasket part numbers at production breaks
- Engine Performance Protection — a failed or blown head gasket allows combustion gases to escape the chamber, causing power loss, overheating, and coolant or oil contamination; replacing it promptly with the correct OEM part restores full compression and protects the engine from further damage
The cylinder head gasket sits between the cylinder head and the engine block, forming a critical seal around the combustion chamber, coolant passages, and oil galleries. On GXV390 vertical shaft engines, it must withstand the repeated pressure and heat cycles of combustion while preventing gases, oil, and coolant from crossing between passages. When this gasket fails — through age, overheating, or improper torque — the engine loses compression, may run rough or overheat, and can suffer serious internal damage if not addressed quickly. Replacing it with a genuine Honda part, torqued to specification, restores the seal and protects the engine's long-term health.
Part Details
| Part Number | 12251-ZF5-H03 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Vertical Shaft Engine | GXV390 | 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.
