Without knowing anymore info. I would say that the cam you have is NOT for a L36 engine. .531 lobe lift just sounds way,way,waaaaay off. I'm running a TOTAL lift (that includes a 1.7 rocker ratio) of .538, which is very close to maximum on stock heads. The durations for intake/exhaust are far too big for our engines as well. Unless it's the advertised durations and not the durations at.050 lift.