[twobjshelbys]

Come on Wallace, getting bored? I can't believe you seriously don't know the answer. Which by the way is a Google search away.

Whatever the production years of the GT350. It was the only car it was used in. I think it ended with 2021 model year but maybe it was 2020.

Large displacement FPC engines are a design nightmare. They inherently create sympathetic vibrations that require much more counterbalancing than any other engine. The effects in smaller engines are simply ignored. The effects in the Voodoo were so great that if you look at the underside of a GT350 you will see things dangling from the exhaust pipes near the catalytic converters. Those are downstream dampeners. The fact that the proper installation of Voodoo required external compensation was the reason Ford never released Voodoo as a crate engine. The power train is a "system". In typical crate engine applications the region of influence is a sphere drawn around the engine and is in control of the manufacturer. When the installation leaves that sphere and the manufacturer is not involved, the liability for botched installations, in the case of Voodoo, is almost a given (if you can simulate it, then you have Ford's supercomputers...)

By the way, GM has admitted the design challenges in the new 5.5L FPC engine in the new Corvette Z06. They also extend dampening beyond the scope of the engine. They explained that the transmission used on the Z06 while essentially the same as the standard Corvette operationally, has extended "ribs" to stiffen the case and absorb the engine vibrations. And they said, we're leaving some of it behind because we can't get rid of it all and it'll be seen as a "personality" of the car.

Ford's version was more difficult - they started with the modular Coyote engine. GM started from a blank slate and concluded that they should shorten the stroke. That helped some...