While rotating the motor trying to find my "click",
I noticed that one of my pushrods has a point in its travel where there is no tension at all. and I am able to lift it up and down between lifter and rocker arm a good 1/16 of an inch or so.
Bad rocker arms?
(I have replaced as new just about everything in this motor)
thanks as always
Sounds like adjustment to me too, Top. The "best" way to do it is to follow a procedure Mr. P-Body espouses because that will result in a consistent preload across all 16 lifters. If perchance you've already filled/soaked the lifters in oil, then you'll probably want to use the alternate method.
To do it right, you'll want both valve covers off and a way to turn the motor over with a wrench, using the crank bolt. Start with cylinder #1 (front, driver's side) and turn the motor until you see the exhaust
valve just beginning to open. Adjust the intake
valve for cylinder #1. The "old" way is to tighten the rocker nut just until you've taken all the slack out of the pushrod - i.e. - you can't move it up and down. Then tighten the rocker ball nut an additional 1/4 to 1/2 turn (the specific amount isn't as important as doing 16 exactly the same). Turn then engine over about 90 degrees until you see the exhaust valve for #8 just starting to open --- adjust #8 intake the same way. . The "new" way is to use a dial indicator and tighten the rocker nut to depress the piston inside the lifter a specific amount (I forget the distance, but maybe Mr. P will be along shortly.) Lather, rinse, repeat adjusting all the intake valves in firing-order sequence 1-8-4-3-6-5-7-2. You'r half done at this point. Now turn the motor over until you see #1 intake
valve open all the way and just starting to close. Adjust the exhaust
valve for that cylinder the same as you did the intake. Work your way ariound again, setting each cylinder's exhaust valve just after you see the intake beginning to close.
There's another sequence that lets you do two valves at once, but it can get you "off" especially if you've got a longer duration cam with a little attitude. Doing all 16, one at a time, through two complete engine revolutions is always better an more consistent.
What you're accomplishing by watching for the exhaust valve beginning to open, is making sure that the intake valve is fully closed and the lifter on the base circle of the cam. Likewise, when the intake is just beginning to close you know the exhaust is fully closed and the lifter on the exhaust lobe base circle.