The Honda 12110-Z6L-305 Cylinder Head is a genuine OEM component designed for GX630, GX660, and GX690 horizontal shaft engines and GXV630, GXV660, and GXV690 vertical shaft engines. As a direct Honda OEM part, it is manufactured to the same specifications as the original, ensuring a proper fit within the combustion chamber assembly. This cylinder head is built for Honda's large-displacement V-twin engine lineup, making correct part identification essential — always verify your engine's serial number against the fitment table before ordering.
Key Features
- Genuine Honda OEM Construction — sourced directly from Honda, this cylinder head meets the same dimensional and material requirements as the part that left the factory, preserving combustion chamber geometry and proper valve seat alignment
- Broad Large-Displacement Fitment — covers GX630, GX660, and GX690 horizontal shaft engines as well as GXV630, GXV660, and GXV690 vertical shaft engines, spanning both crankshaft orientations in Honda's commercial V-twin lineup
- Serial Number Verification Matters — Honda supersedes cylinder head part numbers at serial breaks, so confirm your engine's serial number against the compatibility table to ensure part number 12110-Z6L-305 is correct for your specific unit
- Restores Compression and Combustion Integrity — a warped, cracked, or damaged cylinder head causes compression loss, overheating, and hard starting; replacing it with this OEM component returns the engine to proper operating condition
The cylinder head seals the top of the engine's cylinder bore, forming one wall of the combustion chamber where the air-fuel mixture is compressed and ignited. It houses the valves, valve seats, and valve guides that control the intake and exhaust cycle, and it provides the mounting surface for the valve cover and related components. When a cylinder head is cracked, warped, or eroded at the sealing surface, compression drops, coolant or oil may enter the combustion chamber, and the engine will run poorly or fail to start — making timely replacement critical to keeping the engine in service.
Part Details
| Part Number | 12110-Z6L-305 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX630, GX660, GX690 | 1000001-1040054 |
| Vertical Shaft Engine | GXV630, GXV660, GXV690 | 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.
