Is this something one of your computer programs told you or learned from application?
I looked at the cam cards from the last three cams I bought, two Hughes Engines and a Comp solid roller. None of the three show an advertised duration any lower than .020". The Comp shows it at .020" and .050", their lobe chart shows it at .020", .050" and .200". Again nothing at .004" or .006". Call Dave Hughes and ask for the duration at .006" on his cams and see what his reaction is. He will give you the .200 numbers though.
Basically the numbers at .004-6" only tell you when the valve starts to open, not really much useful information there.
Maybe you should call the cam companies and inform them of the error of their ways. Until Dwayne Porter, Brett Miller or Dave Hughes tell me to use anything else I'll keep using .050" and .200" for my comparison.
