This Ford Motorcraft valve cover gasket set is designed for the left side (driver side) upper and lower valve cover sections on 2008–2010 Ford 6.4L Power Stroke engines. The 6.4L uses a multi-piece valve cover and rocker box arrangement, and this gasket set is built to seal that assembly properly on the driver-side cylinder head in F-250 and F-350 Super Duty trucks.
Over time, factory valve cover gaskets can harden, shrink, or take a permanent set from heat and clamping force, which leads to oil seepage and leaks around the perimeter of the cover or at harness pass-through points. Replacing the left-side upper and lower gaskets during valve train work, injector replacement, or rocker box service helps restore a clean, reliable seal and reduces the chance of oil drips on the exhaust, frame, and undercarriage.
As a genuine Motorcraft part, this gasket set is molded to the correct profile for the 6.4L valve cover and designed to handle the elevated temperatures and oil exposure typical of a turbocharged Power Stroke diesel. That makes it a solid choice for daily driven work trucks, heavy towing rigs, and fleet vehicles where minimizing leaks and maintenance-related comebacks is important.
Using OE-style gaskets also helps ensure proper sealing around critical areas such as bolt holes and any electrical or injector harness pass-throughs, which can be problem spots if generic gaskets are used. When combined with careful cleaning of the sealing surfaces and correct torque on the valve cover fasteners, the new gaskets help keep the top end of the 6.4L dry and easier to service in the future.
For owners searching for a “left side 6.4 Power Stroke valve cover gasket,” “8C3Z-6584-C gasket set,” or “Motorcraft driver-side valve cover gasket 2008–2010 6.4L,” this part provides an OEM-quality solution tailored specifically to the 6.4L Power Stroke platform.
