Question measuring duration @ .050

i used to run that cam , and measured it with success. the only way i can figure it out from your measurements is this. you are 7* past and 43* before on a 180* spread. which means the CAM duration is 180*-7*-43*= 130 CAM degrees. because you measured on the cam , for crank degrees multiply by 2 , which gives 260* duration at .050 . although this seems a little high for the 557 mopar, keep in mind that the .050 measurement is for .050 NET VALVE LIFT. that means that you should be looking for (.050 +lash divided by 1.5) at the cam. this means you should check on the cam at (.050+ .028 / 1.5 )= .052 on the intake and ( .050+ .032 / 1.5 )= .055 on the exhaust. these checking points should bring back duration in line with the specs. for my cam, my measurements gave low to mid 250`s duration at 050 but advertised ( .006 at the VALVE) gave me a low to mid 280 number , which is lower than the specs. hope i didnt confuse you , any questions just ask. after all , this is just simple maths.