I'm gonna assume that the advertised lift for intake/exhaust is including stock rocker ratio of 1.6 - if it IS just lobe lift and not total lift, then you are looking at a total lift of .819 to .849...dunno of anyone ever attempting to run that much lift on a 3800 - The next problem I see is the two different lifts advertised. one screen says .531 lift, but under specification tab it's advertised as .512- I suggest contacting Comp and/or Jegs to straighten this out.