What "standard" 2 litre engine? The engine in the Fiesta ST is only used in the Fiesta ST in the ford range.
ST150 ENGINE (Also badged duratec ST)
Mazda developed engine actually called the duratec HE
is not a detuned version of the st170 engine.
chain driven double overhead cam
inlet manifold to the front
all alloy construction
in an st150