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I don't remember the details, it was just something he mentioned when I was thinking of putting aftermarket studs in my new engine. I think from memory they were both tested to 30 tons which I suppose means ultimate strength. You are right about not knowing what you are getting and the complexity of knowing which is "best". My dad's old blown Triumph ran plain old cast Hepolite pistons with 85% nitro! Regards Lorcan > > That's interesting. Was that a tensile test for ultimate strength?