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problem adjusting valves at gm350 carburated

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  • problem adjusting valves at gm350 carburated

    when i was adjusting the valves of my engine (i bought the block with heads new last year but hasn't still worked properly) i find out that at three cylinders when i was adjusting the nut 1 turn back the compression was lower.Doing a leakdown test i find out that the leak stopped at 1/2 to 1/4 turn back of the intake valve.At that point the compression got higher (190 instead of 175).At which point should i adjust the valves? May this thing happen at a brand new block ? Does this thing may mean something?
    (Bond-O no,no, not yet....)

  • #2
    Re: problem adjusting valves at gm350 carburated

    Are you doing it on a hot running engine or the static cold method? if the latter, the lifter probably doesn't have enough oil in it, you have adjusted too far down past 0 lash to start with, or you have bad lifters. Also, if your intake valves have tuliped, it may cause a similiar issue.

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    • #3
      Re: problem adjusting valves at gm350 carburated

      Here is a video I made that shows you how to adjust the valves. Yes its on a 3.0 but its the same procedure for adjusting them on your 5.7 its just in a different order and you give one complete turn on the nut instead of 3/4. If you want to adjust the one rocker, just bring that piston up on TDC during compression stroke. You can adjust both rockers then if you want...

      http://forums.iboats.com/showthread....justment+video

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      • #4
        Re: problem adjusting valves at gm350 carburated

        when i was adjusting the valves of my engine
        Ayuh,.... How,..?? Exactly, are you doin' the adjustin',..??

        As noted above, it sounds like yer gettin' 'em too tight...

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        • #5
          Re: problem adjusting valves at gm350 carburated

          If you bought a new block with heads, why are you adjusting the rocker arms? It should already be done. Or I'm missing something. I have always adjusted them wet, with the valve covers off, engine running, oil clips on, zero lash plus 1/2 turn.
          1986 Century Riviera 6 Meter 350/260 Alpha 1

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          • #6
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            Re: problem adjusting valves at gm350 carburated

            6meter's method NEVER fails!

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