Whatever happened to this ?
I think the new Ford "Bobcat" Dual Fuel Engine is what effected the 4.4...
a 5.0-liter V-8 Bobcat engine could potentially produce 500 horsepower and 750 pounds-feet or more of torque............
The efficiency gain and torque are comparable to current turbodiesel engines, like Ford’s 350-hp/650 lbs.-ft. 6.4-liter Power Stroke, but at about a third of the cost and with the advantage of cleaner emissions without expensive exhaust aftertreatment hardware.