not on a cylinder head. I was unaware of that at the time of my test. I would not have been able to test them that way without fabricating a plate for the flowbench though. **Opinion Alert!*** :) Regardless of the differences, it is my OPINION that tests performed in an environment as close to the operating environment as possible yield the most accurate results. I am not calling AMS' test into question, I am just saying what I think about the tests. I got an email from a guy who can do the metal test, so we'll see what happens with that.
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