Here are some pics of what a person needs to do in order to convert the hydraulic lifters over to a hybrid solid adjuster. I just completed this P90A head conversion. My solid cam works great!

How about a detailed step by step description of the process?

OK!

1) Take you hydraulic (hyd) lifters apart. (wire brush the bases) All you need are these hyd bases.

2) Cut the top off the hyd base. Leave 50% of the nut height. (That's all you need to screw the base into the head) I used a cutoff wheel to cut the excess off and then machined them all the same depth. (see pic at the end of this post)

3) Clean up your set of solid adjusters. (wire brush them)

4) Place the solid adjuster in your lathe. Turn the threads down until it slides into the hyd base. (Where the hyd piston used to be)

5) Turn the base nut down and leave the "slot" for the triangular retaining clip. You must keep this slot for the clip to go into. You can machine the nut down to just .020 of a lip. This will slide onto the top of the hyd base. Leave an upper lip above the slot about .050 high and .050 thick. (see attached pic of this slot) I have a pic of the first one we did. It DID NOT HAVE THIS SLOT . Please look carfully at the pic. The finished solid hybrid adjuster is correctly done

6) Put the adjuster screws and nuts into the machined solid base to make certain the threads are clear. If you have any problems, run a tap through them.

7) I cleaned the hyd base interior with some scratch-all material. It must be clean to have the silver solder adhere to the metal. I cleaned all parts with brake clean.

8) Place the hyd base in a vise. Slide the machined solid adjuster into the hyd base. Heat the unit and place your flux (pull the adjuster out a ways) on both surfaces. Dab on the silver solder until it adheres. Twist the adjuster around a bit to spread the solder and gently tap the the adjuster down into the base.

9) Let it cool and it is ready to install into you P90A head. (I installed the base with a socket to make certain they were tight.

10) Turn the adjuster down to make certain you have clearance to install the rockers.

11) Install the retainer clips

12) Screw the adjusters into the base

13) Install the rocker arms and mouse springs

14) Adjust your solid adjusters. You now have a P90 head!

Here is a pic of the finished hybrid adjuster. Note the slot left in the adjuster.

Note the slot that was retained in the finished hybrid adjuster