Ok, heres my deal. I put these rockers on myself about a year ago. No problems until now. I thought a shady mechanic played around with my rockers because it looked like he took off my valve cover. I decided to go and re-adjust them. No problem, I've done it before. Wrong, BIG PROBLEM! No matter what I do, the motor runs like crap.
Is it because I didn't let the lifters bleed off a little before adjusting them? Does anybody have tips on adjusting these rockers?
Thanks!

 

You adjust them exactly as you would any other rockers on top of a hydraulic cam. Back them off one at a time until they clatter, tighten them slowly until they shut up, kill the motor, put your preload of choice (½ turn or whatever) on all 16 of them, button it back up.

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"So many Mustangs, so little time..."
ICON Motorsports

 

OK. Now I'm confused. Question; why would I add preload after I stopped them from making noise? Also, I didn't think you could adjust full roller rockers that way although I don't know where I got that notion from.

 

You're not adjusting the rockers as such. You're actually adjusting the valve train to the correct length for the lifters which require the same setting regardless of what rockers you are using.

A hydraulic lifter has a cavity filled with oil, and a plunger, and a check valve. The push rod sits on top of the plunger. The idea is that when the rocker is too loose (ticking) the plunger is pushed all the way up by the oil pressure; as you tighten it down, you are taking up the clearance until you get to the point where all the clearance is gone; then you tighten it some more so that the plunger is pushed partway of its travel down into the lifter body. That way, as parts wear and clearance "appears", the hydraulic system in there has some room to "grow" a little bit and take it up.R

Roller rockers have nothing to do with any of that. I also have no idea where you got the notion that they do.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I still don't know where I got that notion from either Out of curiosity, how much mal-adjustment would cause poor performance? Thank for the fill in. If it dosen't work, I probably broke something.

Thanks again!