340 cam specs?

OCG shows the duration at .006 tappet as close to the FSM - not close
FSM is more like.008 at the cam like Engle
SAE is .006 at the valve which is .004 only with a 1.5 rocker
.004 will be somewhere between the .002 and OCG gives but hard to say where
factory cams get longer the lower the measurement
340 cam is like a 280 class crane or cam dynamics or Summit, sealed power, elgin etc .004
or a 270+ comp lunati or other .006 cam

340 68 auto and 360HP cam
279/289 @.004 429/444 114LCA
268/276 @.008