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#4493523 - 08/20/17 10:13 AM Pushrod engines; hydraulic lifters and valve lash settings
Seventh Offline


Registered: 11/11/12
Posts: 234
Loc: NorCal
Getting ready to adjust valves on the old hot rod truck, I've been hearing a tapping noise from passenger side valve train area. Pretty sure I had a lock nut come loose on the roller rocker...

I've always done a half turn after achieving zero lash using the old "spin the pushrod" technique. Ford, chevy, whatever it is, always done a half turn.

Some guys say quarter turn, full turn, I've heard "1/8th turn for racing," etc.

I'm not asking for advice here, just wondering what others do, and why this seems to be a never ending debate among hot rodders. If you ask 10 people you will get 10 answers

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#4493541 - 08/20/17 10:35 AM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
A_Harman Offline


Registered: 10/01/10
Posts: 6949
Loc: Michigan
On my small block Chevy, I spin the pushrod while tightening down the rocker arm nut until I can't spin it anymore (that's assumed to be zero lash), then go an extra 1/2-turn. The Chevy Power manual describes a method where the engine is run with all the valves adjusted using the basic method, and back off each nut until you hear the lifter tick, then tighten down the nut until the lifter stops ticking. This is called "zero lashing". Other engines may use different methods because they are constructed differently.
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#4493552 - 08/20/17 10:44 AM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
funflyer Offline


Registered: 06/26/14
Posts: 708
Loc: Northern Arizona
I've always set them at .030 and use a dial indicator at the lifter plunger. Also, when using a rocker nut with a setscrew, I finish the adjustment while turning both at the same time so they won't come loose.
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#4493587 - 08/20/17 11:35 AM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
On the 351 Cleveland, I torque the rocker arm bolts to the torque spec. Ford had a better idea. smile

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#4493607 - 08/20/17 12:04 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
Chris142 Offline


Registered: 06/05/03
Posts: 16950
Loc: Deplorable in apple valley, ca
Iirc the gm book says 3/4 turn after the noise stops.
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#4493934 - 08/20/17 07:17 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
Shannow Offline


Registered: 12/12/02
Posts: 40141
Loc: 'Stralia
On my Holden 6s (that used the chev arrangement), I did the running adjustment once, and once only.

After that used the finger twist and 1/8 turn...I used to rev those REALLY hard, and didn't want "pump up".

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#4493948 - 08/20/17 07:27 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
Silk Online   content


Registered: 07/26/03
Posts: 4609
Loc: New Zealand
We used to do them running - oil everywhere. Back off until they clack, then down 1/2 or 3/4 turn...there was usually a spec.
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#4493964 - 08/20/17 07:47 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Merkava_4]
funflyer Offline


Registered: 06/26/14
Posts: 708
Loc: Northern Arizona
Originally Posted By: Merkava_4
On the 351 Cleveland, I torque the rocker arm bolts to the torque spec. Ford had a better idea. smile



My 66 389 is the same but too many variables make it not very accurate, i.e. deck mill, head gasket thickness, valve stem height and rocker ratio. Much easier to make them adjustable.
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#4494033 - 08/20/17 09:19 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh]
NYEngineer Offline


Registered: 12/12/06
Posts: 1616
Loc: NY, NY
Small Chevys always got 3/4 turn.

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#4494068 - 08/20/17 10:24 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: NYEngineer]
turtlevette Offline


Registered: 12/24/13
Posts: 3649
Loc: Massachusetts
I've always done 3/4 turn. I'd like to try zero lashing to see if I can get it to rev higher.
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#4496067 - 08/23/17 11:59 AM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: NYEngineer]
circuitsmith Offline


Registered: 12/17/09
Posts: 629
Loc: Wash, DC
Originally Posted By: NYEngineer
Small Chevys always got 3/4 turn.


That's what the 6 cyl in my '76 Nova called for.
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#4496280 - 08/23/17 05:11 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: circuitsmith]
NYEngineer Offline


Registered: 12/12/06
Posts: 1616
Loc: NY, NY
Probably the same lifters.

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#4496534 - 08/23/17 10:26 PM Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: NYEngineer]
Shannow Offline


Registered: 12/12/02
Posts: 40141
Loc: 'Stralia
Originally Posted By: NYEngineer
Probably the same lifters.


Holden 6 was too...

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