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Proper vale adjustment

This is a discussion on Proper vale adjustment within the Technical / Maintenance forums, part of the General Discussion category; Ok i have read numerous threads looking for the proper valve adjustment for a vortec 350. I need to readjust ...

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    Proper vale adjustment


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    Ok i have read numerous threads looking for the proper valve adjustment for a vortec 350.
    I need to readjust my valves tomorrow and i was planning on doing them while the truck is warm.
    I was going to get the motor hot, remove the valve cover. loosen the rocker til it taps. tighten til the tap is gone then go 1/2 turn. i hear 1/4 turn, 1/2 turn 3/4 turn and 1 full turn. which is right?

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    Supporting Gold Member GreaseDog's Avatar
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    Re: Proper vale adjustment

    1/2 turn has worked for me before. i dont like setting them with the engine running though, too messy.
    77 Chevy K20 - 80 GMC K2500 (in pieces)
    90 Chevy K3500 - 93 Chevy C2500 (in pieces) - 94 Chevy K1500

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    2nd Amendment Supporter mudbuddy's Avatar
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    Re: Proper vale adjustment

    so GD how do you set em with the engine off? I have a set of slide on clips that go on the rocker arms and cover the oil holes, works great keeping the oil from shooting all over the inner fender panels.

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    Supporting Gold Member GreaseDog's Avatar
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    Re: Proper vale adjustment

    haynes or chiltons manuals have a sequence on which valves to adjust with the #1 piston at TDC, then rotate it 180*, and to the rest of them. take the pushrod between your fingers, and roll it back and forth, when you get to the point that you start feeling resistance, go 1/2 turn more. works every time.
    77 Chevy K20 - 80 GMC K2500 (in pieces)
    90 Chevy K3500 - 93 Chevy C2500 (in pieces) - 94 Chevy K1500

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    Re: Proper vale adjustment

    thats the way i did mine grease but the manual i was using said to go a full turn after finding zero lash.

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    Registered User jim27299's Avatar
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    Re: Proper vale adjustment

    I know the manuals say to do a full turn, but that is too much for me. I've tried going the full turn past zero lash and the truck runs rough; seems like a good way to bend a pushrod. I agree with using 1/2 a turn.
    1997 K1500 - Vortec 350, Edelbrock shorty headers, Magnaflow Catback, 0411 swap, Self tuned
    1995 Tahoe - TBI 350 with Vortec heads, 4WD, Edelbrock shorty headers, Flowmaster 50 series, Self tuned

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    Supporting Member brutal's Avatar
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    Re: Proper vale adjustment

    ok, when i did this, i went 1/4 turn, whats the engine doing after you do one? it seems to bogg down

    1997 K1500 Built vortec 355
    transbuilderguy built 4L65E, yank, 14 bolt

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    Registered User jim27299's Avatar
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    Re: Proper vale adjustment

    Are you adjusting it when running when it bogs down? I always adjust the engine when cold now. Typically when you start the engine up after you have just adjusted the valves it will run rough for a few seconds until the lifters get pumped up with oil, but that's normal. 1/4 turn should be fine.

    If you adjust the engine when running it definitely will bog down for a second or two as you adjust each valve, but again this is normal as long as it doesn't stay like this.
    1997 K1500 - Vortec 350, Edelbrock shorty headers, Magnaflow Catback, 0411 swap, Self tuned
    1995 Tahoe - TBI 350 with Vortec heads, 4WD, Edelbrock shorty headers, Flowmaster 50 series, Self tuned

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    Supporting Member brutal's Avatar
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    Re: Proper vale adjustment

    yea engine runnin, it stables out, bnut just wondering why it does tht

    1997 K1500 Built vortec 355
    transbuilderguy built 4L65E, yank, 14 bolt

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    2nd Amendment Supporter mudbuddy's Avatar
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    Re: Proper vale adjustment

    James, GD is adjusting them the way I set my solid lifter lash on the race motor, the reason it will run funky when setting 1 turn while running and then starts to run fine is it takes awhile for the lifter to bleed off some oil pressure and it is hanging the valve open a tad bit. The best setting is 1/2 turn after the noise is gone, so I just set them till they no longer clack, shut the motor off and then do 1/2 turn on each valve, let the lifters bleed off and then restart the engine back up.

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    Supporting Member brutal's Avatar
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    Re: Proper vale adjustment

    o, ok. thanks for clearing that up for me mudbuddy.

    1997 K1500 Built vortec 355
    transbuilderguy built 4L65E, yank, 14 bolt

 

 

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