[James L Miller]

I'm not familiar with your engine or the parts you are testing. I'm going to assume all the rocker arms are aluminum. It would be interesting to check a steel rocker arm and see how it compares. The modulus for steel is 3X higher than aluminum, so it deflects less. The density is also about 3X higher as well. The ideal rocker arm material is beryllium, which has a modulus about 5X higher than aluminum and is lighter than aluminum or magnesium. Too bad there are health issues machining it and of course, it's expensive.