I'm putting the rest of the valve train on a chevy 350, and I'm kinda second guessing myself on setting lash,if there even needs to be. They are 1990 heads with studs coming out instead of installing a bolt. The rocker rests on the push rod and valve, there's no spacer under the rocker. What I intend on doing is put it all together, with the lock nut, and tighten it until the pushrod seats itself on the lifter and the lash is gone, and then just cinch it down about a quarter a quarter of a turn. I can't find anything on a torque value anywhere for this, so that is the solution that I came up with. This is the first time dealing with a valve train like this, I've always messed with the kind with the bolt and setting the lash. If this doesn't sound right to you, please stop me. Any advice would be awesome. Thanks-

Rick

Get a Haynes manual that covers the truck that the engine is in.  Basically, you have to rotate the  engine a about 1/2 turn at a time by hand and adjust each intake and exhaust push rod as the cam shaft lifts the lifter.  You can't just tighten them all down at once, they will be set wrong. Double check the Haynes manual, but if memory serves me correctly, start with the engine at TDC and begin with the #1 cylinder.  Spin the push rod in between your fingers as you tighten the rocker nut until it's just snug enough so the push rod doesn't spin freely. You have to follow the firing order as you rotate the crankshaft (1/2 a turn at a time it think) and tighten the rocker nut in the firing order.

With hydraulic lifters you are not really setting the lash like the older engines with a feeler gauge, but removing the free play in the valvetrain between the cam, lifter, push rod, rocker, and valve.

I hope that helps.

Yep thanks for the help. I figured it out today, your memory was correct. That's exactly how to do it. I got thrown off with these hydraulic lifters, I'm so used to setting the lash with mechanical lifters, and adjusting them, over and over again that my mind went blank when I went to install these. Thanks guideolyons,

Rick