327 valve lash setting? - Team Camaro Tech
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post #1 of 15 (permalink) Old Sep 30th, 09, 12:06 AM Thread Starter
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327 valve lash setting?

Hey guys, once again I want to do something I haven't before, and that is check the lash on my 327 (seemingly stock? with mech. lifters?)... assuming it is stock with the mechanical lifters, what would be the valve lash needed (cold I guess) for this setup? I am having trouble finding this # for some reason.

Oh, and assuming iron block and heads, what would be the cold vs. hot lash difference? So I can check it hot and cold? Would you subtract how many thousandths when cold?

Thanks!
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post #2 of 15 (permalink) Old Sep 30th, 09, 08:14 AM
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Re: 327 valve lash setting?

No stock 327 in a 1st gen with solid lifters. Any idea what the 327 is out of? If you have to guess at what the cam is, I think you are better off checking each rocker just to see and make a judgment call from there. If the engine is running well as it is the lash will be close, maybe a thou or two loose on some. This might be a good question for the prev owner or engine builder...

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post #3 of 15 (permalink) Old Sep 30th, 09, 04:52 PM Thread Starter
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Re: 327 valve lash setting?

Well, I am afraid I won't get any help with the engine info from the previous owner, as he didn't know. I bought the thing to do an ls1 swap, but the resources for that are temporarily on hold, so I am trying to check everything and run this for the time being. Plus these pushrod style motors and carbs are fairly new to me, and am admittedly a noob with them!

Ok, well I just thought it would have solid lifters, because there seemed to be a lot of slack in the rockers... I could wiggle them, and figured that was from having x amount of lash. I didn't expect them to all be tight, but thought some would be or w/e.

At any rate, this kind of just led me to wanting to double check and make sure the rockers are set right because I am idling at 14.5-15" Hg and it seemed low. It could be rings or w/e too, but yep, gotta learn what to do with the rockers, and no time like the present!

Is there a good way to tell what kind of lifters are in there without taking the whole top end off? I don't know what I should be looking for with either type of lifter and their rockers.
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post #4 of 15 (permalink) Old Sep 30th, 09, 05:07 PM
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Re: 327 valve lash setting?

Hydraulic lifters would be set to zero lash and some pre-load, usually 1/2 turn on aftermarket cams and 1 full turn on old factory cams. If you close the valves on any given cylinder and check for pre-load vs lash you should be able to identify solid vs hydraulic unless they are grossly loose mis-adjusted hydraulics.

I get the impression you believe the engine to be original to the car, have you verified that it is? Even still it could have gotten a replacement cam any time over the past 4 decades and either solid or hydraulic could have been used...

14.5-15 hg of vacuum at idle is respectible especially if it's an aftermarket cam...

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post #5 of 15 (permalink) Old Sep 30th, 09, 05:11 PM
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Re: 327 valve lash setting?

brownie....You must know what type of cam is in that motor before we can say anything!....Does the motor make any kind of valve ticking noise coming from the valvetrain which may or may not indicate solid lifters or even hydraulic lifters which are out of adjustment?.....We need to know more info to guide you through the valve adjustment!
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post #6 of 15 (permalink) Old Sep 30th, 09, 05:52 PM Thread Starter
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Re: 327 valve lash setting?

Dang, I was afraid of that!

Well, it sounds to me like there is a ticking coming from one or more areas under the valve covers. Seems to come and go though. Maybe I just haven't paid enough attention to it.

You can see the lifter with just taking off the intake manifold and carb right? I mean you would be able to see the tops and notice if it is hydraulic or not?
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post #7 of 15 (permalink) Old Sep 30th, 09, 05:56 PM Thread Starter
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Re: 327 valve lash setting?

I suppose I could experiment with a couple rockers to see what kind of preload etc there is already, or isn't/or lash too.
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post #8 of 15 (permalink) Old Sep 30th, 09, 06:01 PM
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Re: 327 valve lash setting?

You don't need to pull the intake, if you don't want to check for lash vs pre-load as suggested, you can take one rocker off and use the pushrod to collapse the lifter (push down on the push rod). A solid lifter won't let you push down on it.

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post #9 of 15 (permalink) Old Sep 30th, 09, 06:01 PM
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Re: 327 valve lash setting?

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Originally Posted by brownnote View Post
Dang, I was afraid of that!

Well, it sounds to me like there is a ticking coming from one or more areas under the valve covers. Seems to come and go though. Maybe I just haven't paid enough attention to it.

You can see the lifter with just taking off the intake manifold and carb right? I mean you would be able to see the tops and notice if it is hydraulic or not?
Yes, you can see the lifters in the valley under the intake. Just be careful not to drop anything small in there!

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post #10 of 15 (permalink) Old Sep 30th, 09, 07:51 PM
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Re: 327 valve lash setting?

You should be able to just remove one rocker, pull out the pushrod, shine a flashlight in the pushrod hole, and see the top of the lifter. A hydraulic one will most likely have a little retaining spring showing over two edges of the cup parallel with one another.


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post #11 of 15 (permalink) Old Sep 30th, 09, 10:20 PM Thread Starter
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Re: 327 valve lash setting?

ahhh, good call, I will check this out when I get a chance.

just for giggles, what is the lash for a relatively stock/mild cam 327 solid lifter setup?
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post #12 of 15 (permalink) Old Nov 18th, 09, 11:48 AM Thread Starter
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Re: 327 valve lash setting?

digging this up!

Ok, had a chance to check the lifter out, and it appears to be the hydraulic one. It had more of a flat c-clip style retainer on the inside-didn't look like wire. Does that mean it is hydraulic?
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post #13 of 15 (permalink) Old Nov 19th, 09, 06:43 AM Thread Starter
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Re: 327 valve lash setting?

well, at this point I would say they are set up as hydraulic lifters due to the 1/8th -1/4 turn of pre-load in them. really seems like 1/8th turn though. From what I gathered, the c-clip style top could be solid or hydraulic with some manufacturers.

I am going to fix my slipping main crank bolt and mark the balancer etc so I can know for sure where tdc is, and that all the valves still have the proper amount of pre-load.

I tried to turn the motor over by hand the the crank pulley bolt was slipping! Dangit!
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post #14 of 15 (permalink) Old Nov 19th, 09, 04:07 PM
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Re: 327 valve lash setting?

I sent you a PM with my number. Since you didn't indicate what year your car is I'm gonna guess that you have a 350 or possibly a large journal 327 as it has a balancer bolt. Small journal 327 balancers were a press fit unless you had the crank snout machined.

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post #15 of 15 (permalink) Old Nov 19th, 09, 05:20 PM Thread Starter
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Re: 327 valve lash setting?

Got the pm, its a 327. Its in a 68, but I couldn't tell you really anything else about the motor, and what year it was. Just seems like a fairly basic 327 w/stock or mild cam maybe, and I think hydraulic lifters, 600 cfm holley etc. Nothing special.
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