I don't remember the exact weight, but they are HEAVY! The big concern, besides weight, is the length of the engine and the leverage it puts on the stand. I modified the 4-wheel stand I use on the stovebolt engines with an extension about a foot long, with an extra caster wheel. That prevents any kind of tip-over if things get a little off-balance. Definitely get a stand that extends past the end of the crankshaft snout to prevent any possibility of overbalancing the assembly, and the heavier the weight rating, the better!
Jerry