ok i have a comp cams xtreme energy kit for sale for a sbc, comes with cam, lifters, and valve springs. i really need to get rid of it. the specs for the cam are 268/280 advertised duration and 224/230 duration at .50 with .477/.480 lift on a 110 lobe separation.  it was the cam in my truck before i took it apart it ran good just decided to go bigger.    $135.00 for everything