the redstone engines are chinese in origin, or at least that is what they were when first introduced here in the US
they are massive changfa looking monsters and at least those had no relation to indian or any other blackstone engine as i recall.
i seem to think they were in the 1200 cc range, maybe larger and 28 to 30hp or so?
but then again, i am not sure, it has been a while and i have slept since then
bob g