1/2 Turn?
Half turn is correct for a BBC "WITH" 1.7 ratio rocker arms.
While your heads do have BBC size studs...You do not have 1.7 rockers. So 1/2 turn may not get preload to manufacturers minimum spec.
At zero lash (no slack at all) the pushrod will be just a little harder to spin with your fingers. Feeling for up/down is way before you get to zero lash.
Need these lifters preload specs. Then measure the first valve adjustment to see how much turn it takes to get preload right where you want it. Then you can just do the turn thing on the rest of the valves.
With preload set with less than the minimum spec...You could easily have clickety click valve noise. That clickety click is hard on all your valve train components.
And just barely finger tight with the set screw so the nut can turn and lock it down. Little more preload is better than not enough.
Clay
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