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Old 03-17-2012, 08:01 AM
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valve adjustment

i have sbc 350 when i adjust valves 0 lash then half turn doesnt wont to run if i back off till rocker arms are loose runs ok why is that.its like it has solid lifters but doesnt

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Old 03-17-2012, 08:27 AM
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Quote:
Originally Posted by james chevy
i have sbc 350 when i adjust valves 0 lash then half turn doesnt wont to run if i back off till rocker arms are loose runs ok why is that.its like it has solid lifters but doesnt
It may be the method you're using to find zero lash. If you're twisting the pushrods, that could be your problem because only an experienced builder will have the experience to "feel" when the play goes away.

A more accurate method, particularly for someone who does not build motors day in and day out, is to jiggle the pushrod up and down and slowly tighten the nut. Have your buddy hold the rocker tightly down against the valve stem while you jiggle the pushrod up and down and tighten the nut. When you can't jiggle it any longer, you are at zero. Of course, you also need to be on the heel of the cam lobe to do this. Turn the crank until you get max valve open, then turn the crank one full turn. That'll put the tappet on the heel of the lobe.
http://www.crankshaftcoalition.com/w...valves_SBC_BBC

If, as in your case, you already have the motor running and are past the building stage, go to the boneyard and get a couple of sacrificial valve covers. Cut the tops out of them and bolt them on. Now, you can run the motor and adjust the valves the proper way without gettin' oil all over everything. Back 'em off until they clatter, then tighten to what ever you think is right based on info from the cam grinder/tappet mfg.

Last edited by techinspector1; 03-17-2012 at 08:37 AM.
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Old 03-17-2012, 08:19 PM
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valve

i tried running and adjustment but same thing seems like any pressure on the lifter just dont run right. if u just take the clatter out it runs best. just seems like rocker arms sure loose.
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Old 03-17-2012, 08:52 PM
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If it was only noise on one or two lifters I would say bad lifter but if it does this on any that you adjust, I would surely think you have solid lifters. Did you build the motor and what cam is in it?
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Old 03-17-2012, 09:07 PM
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Quote:
Originally Posted by S10 Racer
I would surely think you have solid lifters.
That never crossed my mind, but makes sense.
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