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post #1 of (permalink) Old 09-15-2000, 10:49 AM
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chevy valve lash

Does anybody know the valve lash on a '73 chevy 350. It is completely stock with solid lifters. I set them all at .025 but it sounds noisy to me. The method I used was TDC, set number 1 exhaust and intake, turn 90 degrees, set number 8, 90 degrees set next, and so forth. I know there are several ways, including the "engine running method", which I have tried without much luck. I also tried the "exhaust just opening, intake just closing" method, except I do not know which is exhaust and which is intake. Thanks in advance.

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post #2 of (permalink) Old 09-15-2000, 11:54 AM
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Re: chevy valve lash

I always do it running.Loosen till the clack, then tighten till they just stop clacking,then 1/2 turn down.You wont get solid lifters to be quiet,they have no cushion to take the slack out of the lifter as the cam goes round.

post #3 of (permalink) Old 09-15-2000, 12:07 PM
 
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Re: chevy valve lash

I can't give you the specs but usually the exhaust setting is wider than the intakes and the cold engine settings are usually wider than the hot (running) settings.
I always set mine hot (Crower Cam specs) on my '57 Chevy long ago ...
Turning them down till the feeler wouldn't move, then letting off untill the feeler could slide slightly (at idle) while pulling on it... then locking them down.... if you call 2000 RPM an 'idle'[img]/wwwthreads_images/icons/smile.gif[/img].
That's how the old time racers in Mesa AZ tought me how to do it.


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post #4 of (permalink) Old 09-16-2000, 09:26 AM
 
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Re: chevy valve lash

The 'Old Time Racers' taught you right.

Pick the correct 'Feeler' gauge for the lash, then with the ENGINE WARM AND RUNNING, tighten down the lash until the feeler gauge can't be slid around in the lash.

Then loosen until the feeler gauge will move around with a little drag on it.
You are set, lock them down.

If the Intake valve specs are different than the Exhaust valve specs (and they often will be), do the Intakes first, then the Exhausts so you don't get confused.
Call your cam manufacturer to find the specs if the cam is other than stock.

Chevys are easy to tell which valve is the exhaust and which is the intake.
Just look below the valve for an exhaust manifold, if there is one, it's an exhaust valve.
Use paint thinner on a rag, and a paint pen to mark the exhaust valve spring retainers.
All small block chevy heads are E-I-I-E-E-I-I-E.

The only part of setting the lash on solid lifters I really hated was it took at least 3 hands to do...
I only have two, and one of those is all thumbs...

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