Are these SBC valve guides worn "bad or OK" - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-02-2011, 01:37 PM
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Are these SBC valve guides worn "bad or OK"

Hello,
I am in front of the decision to put guides in my valve guide liners.

I already have new ones, but I donīt see a segnificant play improvement.

I see that the original bore is not centered but they donīt look oval to me.

How does a worn guide looks like.
I need a comparison

Here my Photos

Regards Bob
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Old 01-02-2011, 04:23 PM
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You really cannot tell by looking at them, unless they are really bad.

Put the valve back in the guide, and hold the valve open, about mid lift. Try to wiggle the valve in a direction across the head, and then the long way of the head. If the valve wiggles a lot more across the head, than the long way, they are worn.
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Old 01-02-2011, 04:33 PM
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These look like stock chevy guides. the reason some are not centered is. When the factory builds these, the guide is integral to the head casting. Then a gang drill bores the guides all at one time. A gang reamer finishes the holes all at one time. So some guide bores are not perfect to the OD. of the guide casting.

The way to check clearance without specialty tools is to install valve into guide. Then raise it about 1" off the seat and try to move it sideways in all directions in the guide. There should be a very slight movement. More than that is excessive. Usually the center exhaust will be the worst.

If you have a mountable dial indicator. Set up for measurement of side motion with valve about 1" off seat.
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Old 01-03-2011, 12:35 AM
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that's how I checked mine.. all 16 showed a barely perceptible amount of movement so I called them all good.. and have no problems so far!
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Old 01-03-2011, 01:49 AM
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Quote:
Originally Posted by kc8oye
that's how I checked mine.. all 16 showed a barely perceptible amount of movement so I called them all good.. and have no problems so far!

An old trick i was taught was to stick the valve in, then put your finger over the hole of the guide where it comes out on the spring end. Seal that hole with your finger. then take the valve and pull it out! if you hear a "pop!" they are good! but if its a weak pop or nothing at all, replace them. Take it for what its worth!
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Old 01-03-2011, 04:15 AM
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Quote:
Originally Posted by BigRoy1978
An old trick i was taught was to stick the valve in, then put your finger over the hole of the guide where it comes out on the spring end. Seal that hole with your finger. then take the valve and pull it out! if you hear a "pop!" they are good! but if its a weak pop or nothing at all, replace them. Take it for what its worth!
^

Do you use oil for the test on the stem?
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Old 01-03-2011, 05:37 AM
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Quote:
Originally Posted by monette999
Do you use oil for the test on the stem?
For measuring, don't use anything- just clean, dry.

HERE is a recent thread on measuring guides.
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Old 01-03-2011, 01:03 PM
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Quote:
Originally Posted by monette999
^

Do you use oil for the test on the stem?
Nope! did it dry, i would think oil would help the seal, and may give unwanted results.
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Old 01-03-2011, 02:53 PM
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I had an old mechanic tell me once the way you can check the clearances on the valve guides was to push the valve all the way down to the top of the guide, then put your finger over the top and push down abit sealing the end. Then with the other hand quickly pull the valve out ...there "should" be a loud sucking popping sound, "IF" the sound is sub-duded or no sound at all then the guide(s) have too much clearance.
NOTE - This guy didn't work in a machine shop, but his own dirt floor garage in west Texas ...many moons ago.
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