I was skeptical at first, but it holds a Duramax long block just fine. It truly doesn't flex that bad at all. The weak point is definitely the legs where they decided it was a good idea to make the L bracket go under, instead of over the legs and then run a single bolt thru it to hold all the leveraged weight of the engine. But it works. I'll put a few welds on it and I'm confident it would hold 1500+lbs after a few spot welds. But at 1000 lbs, it does fine.