I dont think I would trust a big block on one but my engine has been on one for a long time now (twisting and turning and pushing all around the shop) and it has held up with no problems. And one good thing about harbor freight is that they will exchange anything that you have a problem with. One of these days i will have to swing by your shop (once i recover from this knee surgery I had yesterday) to pick your brain a little bit.
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Every time I cross one thing off of my TO DO list,I add two more!!!