Product Description
Brand new, genuine Mercury Mercury Marine / Mercruiser OEM Cylinder Head, 900-8M0138727. This is a factory original equipment item, not aftermarket. NOTE: This is a generic image. Items shown are not included.
This is a genuine Mercury Marine OEM cylinder head for 25 HP and 30 HP, 3-cylinder, 4-stroke EFI outboards (F25M/F30 models). Crafted from precision-machined aluminum, the head features factory-engineered coolant passages, combustion chambers, valve guides, and port profiles to optimize airflow, thermal efficiency, and emissions. It is finished with durable coatings to resist corrosion and sealing issues in marine environments. When installed with proper gaskets and torque values, this head restores peak compression, prevents leaks, and sustains long-term engine health. Supersedes older part numbers and includes UPC‑branded packaging (GTIN 745061040168), ensuring authenticity and traceability.
- Factory-original OEM part—no aftermarket alternative
- Aluminum cast with integrated water jackets, intake/exhaust ports, and valve seats
- Direct fit for F25M/F30 outboards—no modifications required
SKU# 900-8M0138727
Fits:
Designed for Mercury/Mariner 25 HP and 30 HP 3-cylinder EFI outboards, serials 0R106999 and up (F25M/F30)Replaces part numbers 8M0138727; newer head referred under UPC code and seller images point to OEM housing
