ThanX (techinspector1) for your insite. The piston's from KB have a 7.0 cc volume, and i do have both the .028 gasket from GMPerformance, and a set of .041 gasket's that came in a kit. I've called Comp many time's and got some what of a different answer on cam choise mostly steering towards an EXtreem Energy grind like the EX262 because the EXstreem stuff is new tech, and the High Energy 268 is 15 yr. old tech meaning it's out dated and it suposedly bleed's off cylinder presure as opposed to the building of cylinder presure that you get with an EXstreem Energy cam.