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^^^ That is NOT how an engine should be attached to an engine stand. The bolts holding it to the stand are in the lowest bolt holes, with lots of top-heavy weight leveraging stress on the bolts.
Ideally, you want
1. The longest practical distance between the bolts. The bolts going into the second-from-the-bottom holes in the block should transfer to the third-above-the-bottom holes, and
2. The entire engine should sit low on the stand. Typically the stand's pivot point should be approximately level with the camshaft. That engine seems good in that regard. I have trouble with my engine stands getting the engine low enough so it's not top-heavy when rolling it over on the stand's pivot.
I don't know how you could bend Grade 8 bolts going into the block. Grade 5 should be more than enough. I had an Olds 455 and a Pontiac 455 hung from engine stands; the Pontiac ran for half-an-hour, the Olds ran for an hour and a half or more--long enough for the cooling system sealer to patch a pinhole in the cylinder head.
Pontiac engine:
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Shiity Chinese engine stands should get a thread all by themselves. They've pretty-much all got the same problems: Too-small adapter plate, too-short spacers on the arms, ridiculously-short handles for spinning the motor on the too-high-friction pivot. Generally flimsy construction. A fully-dressed big-block wouldn't be more than 700-ish pounds, why does a "1200-pound" engine-stand flex and sag when you bolt up a small-block? Realistically, this is the fault of the Communist Collaborators in America who import these defective designs. The Chinese wouldn't know any better.
I lengthened
all the slots, even tried turning the adapter-plate upside down to see if it'd work better. There isn't enough material (width) on the plate to get this "right", but I got it better.
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The welded-in bolt spacers are only about an inch and a quarter long. They need to be much longer for decent access to the flexplate. I've used 1/2" nuts as spacers, I've used pieces of black-iron pipe as spacers. A friend of mine welded-up his own engine stand, he used wrist-pins as spacers.
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