Well I think everyone one feels as I do. I've lifted with the plate but it makes me nervous. The aluminum threads in the manifold is my nervous point.
4 1/4X20 threads in one inch deep is about the equivalent of a one inch bolt in an inch deep, but the threads in the aluminum have to be a good set of threads in all 4 holes, or I won't use it. And even then I use my chains when ever I can.
I like these, one on each end of the engine.
Makes it really easy to level the engine with these.