Ok im putting a set of ford racing roller rocker arms on (1.6) on. Now i put head gaskets on it before and when i reinstalled the rockers back on i never put each cylinder to tdc. I just tightend them down and my car worked fine. I was wondering do i need to put each cylinder at tdc when i tighten the rollers down or will that really screw thing up if i dont also, will the vavle lash be off if i do just tighten them down?