ok im putting ford racing roller rockers on my (1.6). I was wondering if i have to put each cylinder at TDC? Because before i had to take the heads off and when i was reinstalling the rockers i just tightend them down i didnt put each cylinder at TDC, and my car worked fine. So i was wondering could i do the same with the roller or will it screw anything up, and also will it mess with the vavle lash?