no them heads are not 119 from gm less then that . last set i did was 113 cc with the icon zero head ROL head gasket 9.5 cc head gasket .the CR ended up at 9to4 Icon make two pistons 1c9948 and ic9949 10.6 at a 119 chamber the ic9948 are the ones i used with the 292 casting you can get to 9.3 to 9.5 i do not grind many seats any more a cut them with my tobin arp with the 3-D Hp or mondello cutters. that head is some what hard as gm inducted the EX side .for selling point i put seats most all the time . i done many with out hard seats if not beat in they seem to hold out well. roller rockers i use has alot to do with spring Lbs but the scorpion /howards /pbm rocker .or harland sharp .new comp Ultra Pros . like allways i spend time checking mild lift for the right length pushrods