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Discuss 318 V8 with roller rockers in the rec.autos.makers.chrysler forum at Car Dealer Forums; Hi I am assembling a 2nd pair of heads for my old V8. this pair ...
  1. #1
    Andrew
    Guest

    Default 318 V8 with roller rockers

    Hi I am assembling a 2nd pair of heads for my old V8.
    this pair of heads will have adjustable rollerrockers on them.

    The lifters in the block are hydrolic lifters

    my question is - What do I set the valve gap to with these ajustable
    rockers? Im guessing ZERO to mimic the old steel rocker that you normally
    find in these heads.



  2. #2
    John Kunkel
    Guest

    Default Re: 318 V8 with roller rockers


    "Andrew" <amu1961@bigpond.net.au> wrote in message
    news:EWUgh.9229$HU.5702@news-server.bigpond.net.au...
    > Hi I am assembling a 2nd pair of heads for my old V8.
    > this pair of heads will have adjustable rollerrockers on them.
    >
    > The lifters in the block are hydrolic lifters
    >
    > my question is - What do I set the valve gap to with these ajustable
    > rockers? Im guessing ZERO to mimic the old steel rocker that you normally
    > find in these heads.


    With hydraulic lifters and adjustable rockers you want to preload the lifter
    a specific amount, .020" to .030" is common. Most adjusters have 24 threads
    so one turn equals .0417"; a half turn will preload the lifter about .020"
    and three quarters of a turn will preload about .030".

    With each lifter on the heel of the cam lobe, turn the adjuster until all
    free play is removed (spin the pushrod to feel the drag at zero lash) and
    then turn the adjuster an additional 1/2 to 2/3 turn and tighten the jam
    nut.



  3. #3
    philthy
    Guest

    Default Re: 318 V8 with roller rockers

    what year 318???


    John Kunkel wrote:

    > "Andrew" <amu1961@bigpond.net.au> wrote in message
    > news:EWUgh.9229$HU.5702@news-server.bigpond.net.au...
    > > Hi I am assembling a 2nd pair of heads for my old V8.
    > > this pair of heads will have adjustable rollerrockers on them.
    > >
    > > The lifters in the block are hydrolic lifters
    > >
    > > my question is - What do I set the valve gap to with these ajustable
    > > rockers? Im guessing ZERO to mimic the old steel rocker that you normally
    > > find in these heads.

    >
    > With hydraulic lifters and adjustable rockers you want to preload the lifter
    > a specific amount, .020" to .030" is common. Most adjusters have 24 threads
    > so one turn equals .0417"; a half turn will preload the lifter about .020"
    > and three quarters of a turn will preload about .030".
    >
    > With each lifter on the heel of the cam lobe, turn the adjuster until all
    > free play is removed (spin the pushrod to feel the drag at zero lash) and
    > then turn the adjuster an additional 1/2 to 2/3 turn and tighten the jam
    > nut.



  4. #4
    DeserTBoB
    Guest

    Default Re: 318 V8 with roller rockers

    On Sat, 16 Dec 2006 16:13:24 GMT, "Andrew" <amu1961@bigpond.net.au>
    wrote:

    >Hi I am assembling a 2nd pair of heads for my old V8.
    >this pair of heads will have adjustable rollerrockers on them.
    >
    >The lifters in the block are hydrolic lifters <snip>


    Hydraulic
    >
    >my question is - What do I set the valve gap to with these ajustable
    >rockers? Im guessing ZERO to mimic the old steel rocker that you normally
    >find in these heads. <snip>


    No, you have to center the plunger of the lifter in its bore when its
    body is on the heel of the cam. Simply setting the arms to "zero
    lash" won't do anything constructive at all...you must adjust them so
    the plunger is in the center of its travel in the body. Most people
    do this while the engine is idling hot by backing off the adjusting
    nut or stud until continuous "click" is heard and then tightening them
    down around 2/3 of a turn.

    Having adjustable rockers on a hydraulic lifter equipped engine isn't
    very useful; there are tons of better mods to do to that LA to get
    better longevity and/or efficiency, and this ain't one of 'em.

  5. #5
    John Kunkel
    Guest

    Default Re: 318 V8 with roller rockers


    "DeserTBoB" <desertb@rglobal.net> wrote in message
    news:av4co21ievnnjfv6tkvglq6a663g6ac6t3@4ax.com...
    > On Sat, 16 Dec 2006 16:13:24 GMT, "Andrew" <amu1961@bigpond.net.au>
    > wrote:
    >
    > Having adjustable rockers on a hydraulic lifter equipped engine isn't
    > very useful; there are tons of better mods to do to that LA to get
    > better longevity and/or efficiency, and this ain't one of 'em.


    Nonsense, adjustable rockers allow one to adjust the lifter preload to a
    desired dimension rather than the happenstance preload that results from
    machine work. (head/block milling, valve sinking, etc.)
    Adjusting to the middle of the plunger's travel isn't the goal, adjustment
    is normally made to a minimum preload dimensiion like .020"-.030".



  6. #6
    Steve
    Guest

    Default Re: 318 V8 with roller rockers

    DeserTBoB wrote:


    >
    > No, you have to center the plunger of the lifter in its bore when its
    > body is on the heel of the cam. Simply setting the arms to "zero
    > lash" won't do anything constructive at all...you must adjust them so
    > the plunger is in the center of its travel in the body.


    Only if you want to promptly burn all your exhaust valves, and/or kiss
    the pistons with ALL the valves. "The center of its travel" is WAY too
    much pre-load!!!! About .020 is correct.

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