valve lash question

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valve lash question

Post  78ranger on March 23rd 2016, 1:19 am

Just got done with a head and cam swap in my truck. I've never run an adjustable valve train, or installed a cam or rockers, so I was looking for some feedback before I turned the key. Second guessing myself all over the place. Took me two days to figure out my pushrod length. I set the valve lash at 1/2 turn past zero lash (snuggged up the lock nuts until I felt a little resistance turning pushrods, hydraulic cam, lifters) on base circle of cam, then 1/2 turn past and locked them down. Is that the right way to do it? I'm super stoked and #@*# freaking out to fire it up. This will be my first engine with some real hp, not just a desmogged 460. Thanks for any feedback. Gary.

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Re: valve lash question

Post  rmcomprandy on March 23rd 2016, 10:29 am

Normal street high performance hydraulic lifter pre-load is 1/2 turn more than 0 lash with aluminum heads and 1/4 turn past 0 lash for iron heads.

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Re: valve lash question

Post  78ranger on March 23rd 2016, 10:38 am

Thanks. Sounds like I need to loosen it up a bit.

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Re: valve lash question

Post  rmcomprandy on March 23rd 2016, 10:40 am

78ranger wrote:Thanks. Sounds like I need to loosen it up a bit.

It can be slightly tighter ... just not less.

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Re: valve lash question

Post  78ranger on March 23rd 2016, 1:30 pm

Is setting them all on the base circle of the cam when the intake is off the right place to set from? Seemed more straightforward as it was open and I could see it. I know the EOIC method, but that is just to make sure there is no load on lifters?

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Re: valve lash question

Post  maverick on March 23rd 2016, 2:42 pm

Sounds like you got it right.
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Re: valve lash question

Post  78ranger on March 23rd 2016, 5:38 pm

Thanks guys. Guess I'll quit wondering and fire it up.

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Re: valve lash question

Post  supervel45 on March 23rd 2016, 6:38 pm

And we want to see the burnout too.

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Re: valve lash question

Post  FalconEh on March 23rd 2016, 9:28 pm

I would prime it, then turn it over with the ignition disabled and make sure the pushrod length, adjustment you have seems happy before flaming it.
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Re: valve lash question

Post  69F100 on March 23rd 2016, 9:33 pm

FalconEh wrote:I would prime it, then turn it over with the ignition disabled and make sure the pushrod length, adjustment you have seems happy before flaming it.


X2 plus make sure you follow the cam brake in right so you don't wipe a lob on the cam
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Re: valve lash question

Post  78ranger on March 23rd 2016, 10:21 pm

Yep. Primed it, broke in the cam, all good. This thing screams. Thanks for the help as always.

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