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I have pulled big blocks with them plates, I made one myself, but I do admit that it makes me feel nervous, I use it because I figured that if they failed someone had already sued the manufacturer big time and they would of being recalled already, but I still see them on catalogs.
The tension that only one stud can hold is way much higher than the weigth of an engine, and 4 of them are used, it worries me more the integrity of the threads in the manifold, specially aluminum, but it's a lot more than we could imagine.
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