i am looking to do a b20 vtec i wanna do an aftermarket higher compression piston can i put the aftermarket pistons in and not run in with out the head with no run ability problems i dont wanna do the vtec conversion right away. i know just do it all at once but just weighing my options. can u run the b20 stock on higher compression piston with no tune. thanks for the help i know once again just do the vtec conversion all at once money at this time permits me not to. Thanks for the hep.