Hughes rockers

rmchrgr said
A lot! I have Hughes 1.6 rockers on my motor, took a long time to get it right. A lot of on and off with the rockers and checking with feeler gauges. It's not super critical to get them exactly centered over the valve tip but you have to watch for binding so don't make them too tight.

Using the PVC pipe they ship with the arms helps to keep things in order.

Geometry is a whole other issue that can get pretty involved. You can leave some power on the table if you're way off. I would take the time to check it just to see if it's close. I spent a LOT of time on this. I checked the wipe pattern and it was good. I installed the rocker shims to see if it was different/better and it wasn't. YRMV so don't take my case as fact.

If you can read through this page without your head exploding then you will have a better idea of what you're looking for with rocker arm geometry.

http://www.mid-lift.com/intro-mid-lift.htm

Did you read this part of that link ? WRONG GEOMETRY TWO: (Or, what NOT to do if you own a Chrysler!)*As if the above (WRONG GEOMETRY ONE) isn't enough, my old friend of 40 years who actually knows better (as do Comp Cams), plays on words with web caption humor to get his point across of how wonderful he thinks "REAL" rockers should be installed. This page for the poor Chrysler crowd that Dave Hughes caters to is making a reference to "middle of the valve at mid-lift" as what NOT to do, as if that is what we propose to be correct. Throughout the MID-LIFT.COM web site there are references and instructions that specifically state that setting the roller in the middle of the valve as any reference to correct "mid-lift" geometry is NOT relevant, and I will say it again. It makes no difference where the roller is at atop the valve, and using the "middle of the valve" as a band-aid means of false security that you've got correct geometry is a big mistake. However, having all three tangent points connected to provide 90 degrees with BOTH sides of the rocker, at "mid-lift" is relevant, is correct, and is "REAL" rocker geometry. Dave skirts this small point, and perhaps he just doesn't get it; because he feels compelled to reassure himself by adding that other people believe his twisted explanation too. So take a close look at photos and rhetoric of what "WRONG" geometry looks like. (Thanks, David.)**^