I have a special cut Hydraulic cam with adjustable roller rockers and it is very nice.
Once installed I did basically what Clois said and adjusted them to zero lash and then a bit more. I used 1/8 turn. Many guys use the 1/4 turn but it is more for noise than anything else.
If you want to know the proceedure, here is a quick note.
1. Install cam with as much lube as you can. Dripping is good!
2. You should have presoaked the lifters in 30 weight for a day. Install them.
3. Put your hardened push rods in with lots of assembly lube or antigall ( spelling ).
4. Put antigall or assembly lube on all of the parts of the rockers.
5. Lifters that are all the way down ( not openning valves), can be statically adjusted by turning the push rods as you tighten the outer adjustment nut.
6. Once the rod starts to turn hard or stops, note the location of the wrench and add 1/8 turn. Lock the inner nut when done.
7. You can not do all of the engine without turning it over to adjust the rockers that are up.
8. Once you have adjusted the rockers, prime the engine.
That should be about it.
Good luck and happy holidays
