Valve guide inspection... 
Valve guide inspection...
Thread Starter
TECH Fanatic
Joined: Mar 2003
Posts: 1,946
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Originally Posted by BAD2000TA
Correct me if I'm wrong, but an LS1 does not have valve guides. The rockers are mounted on a shaft to position them properly.
Valve guides are the brass (or iron) sleeves the valve stem slides up and down in....
Check out post #6
https://ls1tech.com/forums/generation-iii-internal-engine/643713-valve-guides.html
There's really no way to visually inspect the valve guides without pulling them. Performing a leakdown test is a good indication and will tell you if they are bad. About the only way I know of without pulling the actual guide would be to pressurize the cylinder so the valve will not drop, pull the valvespring and move the valve with your hand to see if there is any play back and forth and side to side.
The seal will be the major factor in leakdown / compression. I just give it the wiggle test. See if you can find a good set of heads and see if you feel and extra play in your heads.
Thread Starter
TECH Fanatic
Joined: Mar 2003
Posts: 1,946
Likes: 1
Originally Posted by GuitsBoy
The seal will be the major factor in leakdown / compression. I just give it the wiggle test. See if you can find a good set of heads and see if you feel and extra play in your heads.
Will do....
Originally Posted by SideStep
You are thinking of push-rod guides...
Valve guides are the brass (or iron) sleeves the valve stem slides up and down in....
Check out post #6
https://ls1tech.com/forums/showthread.php?t=643713
Valve guides are the brass (or iron) sleeves the valve stem slides up and down in....
Check out post #6
https://ls1tech.com/forums/showthread.php?t=643713
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how will the seal or guide show up in a leak down test??
The valve is closed so no air will get to that part of the valve. The compressed air will also most likely firmly plant the valve square on the seat even if the guide is bad.
Pull the spring then move the valve slightly off the seat and wiggle it. Then do it again at about .500 lift.
The best way is to pull the valve and measure the stem then measure the guide
The valve is closed so no air will get to that part of the valve. The compressed air will also most likely firmly plant the valve square on the seat even if the guide is bad.
Pull the spring then move the valve slightly off the seat and wiggle it. Then do it again at about .500 lift.
The best way is to pull the valve and measure the stem then measure the guide
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.. yupper... I typed brass, but was thinking bronze, same color, right??? 
Originally Posted by 1BADAIR
how will the seal or guide show up in a leak down test??
The valve is closed so no air will get to that part of the valve.
The valve is closed so no air will get to that part of the valve.
You need a dial bore gauge that will measure the 8mm guide and reads in at least .0002" increments. If you can't find a shop local send one head to me, I'll check em for you at a good deal 
