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how to adjust valves ?

need help with a valve adjustment

how to adjust valves ?

Postby AnthonyV [OP] » Jul 19 2012, 5:42am

Hi guys. I got another question for ya. I'm one of the lucky few with the castech heads and I just received my replacements. upon opening the crate I notice it had a tag that said once installed it will need a valve adjustment.

although I'm fairly confident I can do the swap, I have no idea how to do a valve adjustment. Is this something that can be done in amateur garage or does this need to go into a shop with specialty tools? If this is something fairly easy to do then is there anybody that can give me a walkthrough or an idea how it's done?

As always thank you for any help or advice.
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Re: how to adjust valves ?

Postby ASTE25 » Jul 19 2012, 1:04pm

To be honest I have not worked on the new style engine. If it is the same as the old small block it's pretty easy. There are two ways to do it.

(1) With the engine not running: Make sure the cylinder you are working on is at top dead center on the compression stroke. Tighten the rocker down untill all the clearance between the rocker and the pushrod is gone, then tighten the rocker nut an additional 1/2 - 3/4 turn. Repeat for the other rocker for that cylinder. Repeat the procedure for all 8 cylinders.

(2) With the engine running (messier but faster to do): Starting at the front of the engine and work back on each side, back off the rocker nut until the clicking of that rocker starts. Then slowly tighten the rocker nut until the clicking stops. Then slowly turn it down an additional 1/2- 3/4 turn. Repeat this with each rocker until all 16 are done.
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Re: how to adjust valves ?

Postby AnthonyV [OP] » Jul 19 2012, 7:35pm

do I have to do certain cylinders first? I saw a video on youtube and the guy started at number 1 then he did #3 intake then the exhaust on number 5 or something like that. is that way easier? if so do you know the actual order? or do you think I should just go top dead center on each cylinder from front to back ?
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Re: how to adjust valves ?

Postby ASTE25 » Jul 19 2012, 9:25pm

If you are going to do it with the engine off, it's easiest to go in the firing order (1,8,4,3,6,5,7,2). That way you don't have to turn the engine as far to get the next cylinder up to top dead center.
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Re: how to adjust valves ?

Postby AnthonyV [OP] » Jul 20 2012, 2:01am

Thanks a lot for all the great info. The last thing.... Was the torque for the rockers 50lbs?
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Re: how to adjust valves ?

Postby ASTE25 » Jul 20 2012, 2:07am

If they are like the old ones, they are adjustible. They do not have a torque setting. They use a locking nut. Double check to make sure they are like the old small blocks, as I have not been in one of these new ones and what I have told you may not be correct.
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Re: how to adjust valves ?

Postby 09chevy1500 » Jul 20 2012, 2:51am

How do u adjust the valves with it running without oil going every where arent the valve covers off
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Re: how to adjust valves ?

Postby ASTE25 » Jul 20 2012, 7:31am

They make clips you put over the end of the rocker to deflect the oil back into the rocker pivot ball area. That's the way I always adjusted them on my old small blocks. I didn't have as good of luck when trying to do it with the engine off. It's a lot quicker to do it when it's running.
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Re: how to adjust valves ?

Postby AnthonyV [OP] » Jul 20 2012, 4:32pm

Does any auto part store sell those deflectors. If not where could I find some?
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Re: how to adjust valves ?

Postby ASTE25 » Jul 20 2012, 9:28pm

I think I got mine years ago out of Summit racing's catalog. I think Auto Zone used to sell some, but they were not as good as the ones Summit sold. Here are the ones I had: http://www.summitracing.com/parts/MRG-1015/
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