LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

If intake valve is open, you adjust exhaust valve and vice versa?

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Old Nov 21, 2003 | 05:59 PM
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96 WS6's Avatar
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If intake valve is open, you adjust exhaust valve and vice versa?

Can I lash all my rockers that way? By just spinning the crank and when one valve starts to open, lash it's counterpart??? Would that work? These stupid rockers are about to get beat with a bat. I want to drive my car not work on the damn thing all day.
Old Nov 21, 2003 | 06:22 PM
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from my Tech Page:

Method 3


Another cylinder by cylinder method that does not require looking at the balancer position, follows:

(A remote starter switch is quite helpful)
Turn the engine in the normal direction of rotation until the exhaust lifter starts to move up, then adjust the intake valve to zero lash and add your preload. Turn the engine over again until the intake opens completely and then is almost all the way back down. Now, set the exhaust valve to zero lash and add your preload. Continue the above procedure for each cylinder until all valves are adjusted to the same amount of preload. This procedure will work for any hydraulic lifter cam with adjustable rocker arms.
Old Nov 21, 2003 | 06:24 PM
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Why is this true: "Turn the engine over again until the intake opens completely and then is almost all the way back down." Do you have to get it to almost closed?? I'd figure that when it's open the exhaust would be closed right?
Old Nov 21, 2003 | 07:20 PM
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This is the same way Comp Cams explains it. It is to positively make sure that the lifter is on the base of the cam lobe. If don't want to do it that way, you don't have to.
Old Nov 21, 2003 | 07:46 PM
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I did mine cylinder by cylinder the way Shoe mentioned. Don't think I've ever seen him wrong. Still waiting though. Thats the way to do it to get them close as possible. The only diff is that I rotated it til the intake valve was 2/3rds closed. thats what it said to do. I did mine twice when I changed the chain. Anyway I just looked into the intake and watched the valve for a good measurement of what I thought 2/3rds was.
Old Nov 21, 2003 | 10:24 PM
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Originally posted by shoebox
This is the same way Comp Cams explains it. It is to positively make sure that the lifter is on the base of the cam lobe. If don't want to do it that way, you don't have to.
Shoebox, if you told me to drive my car off a cliff I would do it man! Shoebox

I got the rockers adjusted finally. I just did it with the car running, spun the nuts down until they stopped then went a bit past that and tightened the locks. Got it pretty good methinks, I hear a sound on the passenger side but it might be my exhaust leak, one of the two at least lol. Damn ****ty SLP shorties with their 1/4 flanges.
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