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Old 03-25-2003, 02:50 PM
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Post hydraulic lifter adjustment

just finished a 305, installed a new cam and lifter set. Instructions say bring each cylinder to top dead center, turn pushrod back and forth with two fingers until you can feel a drag and tighten 3/4 turn. These are new (dry) lifters. Is this good advice, or what is your suggestion. I can remember doing this years ago, and just tightened rockers until clatter dissapeared. Advice?

[ March 25, 2003: Message edited by: beetle9 ]</p>

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Old 03-25-2003, 03:01 PM
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This is the wat to do it whether the lifters are oiled or dry. Basically takes the slack out of the valve train by slightly depressing the lifter spring so nothing ever bottoms out in operation. The 3/4 turn method is just a little more scientific than taking the clatter out by ear but they both do the same thing. Since it is a static adjustment, lifters don't care whether they have oil in them or not.
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Old 03-25-2003, 07:26 PM
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With the lifters dry, turning them till they stop might depress the plunger before you even go the 3/4 turn past. I always either wiggle the pushrod up and down until the slack is gone or turn them until I feel drag with dry lifters.
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Old 03-26-2003, 07:01 PM
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The best way that I've found to adjust the lifter "preload" is to go to zero lash and a 1/4 turn. The zero lash part just means to take all the free play, (up and down free play) out. You do this by lifting up and down on the pushrod while adjusting the rocker nut. When all of the free play is gone your at zero lash. Then all you do is go 1/4 turn to preload the lifter. Be sure that the one you are adjusting is all the way down. The reason that I use the 1/4 turn instead of the 1/2 or 3/4 turn is that with the 1/2 or 3/4 turn the valves seem to hang open on me all the time. Hope this helps
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Old 03-27-2003, 05:37 AM
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1/4 turn seems awful loose...if you're going to run them that loose it would be a good idea to use the lifters with the flat snap ring rather than the type with the round paper clip type snap ring.

Gm manuals all say 1 full turn,but most performance books recommend 1/2 turn.
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Old 03-28-2003, 04:36 PM
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actually it is simpler that you may think. Take them down to zero lash(no slack in pushrod) Then 1 cylinder at a time EXHAUST OPEN SET INTAKE then INTAKE OPEN SET EXHAUST using 1/2 turn from zero. with either one open the other is on the base circle of the cam and 1 cylinder at a time so you don't forget any
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