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"The gunk could be from not changing oil regularly! Ford engines ran for years w/o PCV!"
And if you ever tore apart an engine that had only a road draft tube, you'd see why the switch was made. It was not uncommon to have so much sludge in the valve covers that the rocker arms left prints in it. This was the main reason that engines of those days were considered champs if they made it to 100,000 miles.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.