The stock 6.4 Power Stroke uses a twin-turbo setup: two variable-geometry turbochargers working in tandem. Ford has not published a single official compressor-wheel size for these units in public documentation.
How the stock turbo configuration works
In Ford's 6.4L Power Stroke, two turbochargers are mounted on the exhaust side of the engine and feed the air intake through a shared intercooler. The turbos are variable-geometry (VGT) units designed to optimize performance from low RPMs to high boost. This twin-turbo arrangement is intended to deliver improved off-idle response and higher peak boost compared with a single-turbo setup.
Is there a published size for the compressor wheels?
Ford's official documentation does not list a specific compressor-wheel diameter or trim size for the stock turbos. Because the turbos are treated as components that can vary by production batch and by OE supplier, Ford does not maintain a public spec sheet with a single wheel size. In the aftermarket and among enthusiasts, you will see references to approximate compressor-wheel classes (roughly in the 60 mm range) when discussing aftermarket replacements, but these are not official Ford specifications.
Implications for performance and modifications
Because the exact wheel size isn’t publicly published, performance differences among stock turbos are more about design tolerances and the overall twin-turbo system than a single fixed bore. If you’re considering performance modifications, research reliable aftermarket options that fit the twin-turbo 6.4L architecture and consider professional tuning to maintain safe boost levels and engine reliability.
Summary
In short, the 6.4 Power Stroke uses a twin-turbo configuration with two variable-geometry turbines; there is no officially published single turbo size by Ford. For precise servicing details or VIN-specific specifications, consult Ford’s service literature or a dealership for your particular truck.