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I remember reading that one of the bigger builders out there shot for no less than .100 on major thrust side up to around 600 hp. Been there done that and have been fine...........

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Everything I've seen says a major thrust surface needs to be .200" at a minimum.

I don't recall what "acceptable" thicknesses for minor thrust or non-thrust surfaces are, but .100" doesn't sound right for those, either.

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Read this years ago in a Hot Rod or similar magazine........been that thin w/my high 11-second 360 and never had a problem but of course thicker would make more sense.