Yea I know but I need a double roller to put bigger valve springs in to run more boost right? Zzp wants me to run 140lb valve springs it seems like alot to me and hard on the valve train for the gains I've asked them several times they said 3800s just need to be sprung more even stock I don't know? I could put 105's on it with a single roller right? I mean its all new what rockers would you put on it with the cam I have though it's .507 lift intake and exhaust.