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Which valves to adjust..

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Old Aug 11, 2008 | 02:05 PM
  #1  
89RsPower!'s Avatar
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From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Which valves to adjust..

Maybe you guys can help me out here.. I'm having a slight mind lapse.. I can't remember which valves to adjust when. Here is how I'm doing it, engine is on a stand, timing cover is off. New cam is in place, hyd roller if anyone's interested.. anyway which valves can I adjust with the timing gears dot to dot and which valves can I adjust with them straight up?
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Old Aug 11, 2008 | 02:39 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
About half of them. . .

Better method is the intake-closing/exhaust opening method. When the intake is about 1/2-2/3 closed after being fully open, adjust the exhaust on that cylinder. When the exhaust is just starting to open, adjust the intake. Repeat 7x.
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Old Aug 11, 2008 | 02:52 PM
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89RsPower!'s Avatar
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Joined: Apr 2002
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From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: Which valves to adjust..

The thing I don't understand is how I'm suppose to determine what the valves would be doing.. Should I just throw the pushrods in, set the rockers on and tighten them slightly and attempt to adjust from there? I don't really know where to start with that method since I don't even have a single valve adjusted.. I thought I could use the pushrod spinning method and adjust x intake and x exhaust valves while it's set to firing on #1 and than adjust the remainder with the engine set to fire on #6?
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Old Aug 11, 2008 | 06:59 PM
  #4  
Trick414's Avatar
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From: Fort Worth, Texas
Car: 1991 RS Vert
Engine: LO3, 305, TBI
Transmission: 700R4
Axle/Gears: 3.42
Re: Which valves to adjust..

From this thread:

https://www.thirdgen.org/forums/tech...adjusting.html

I tried the listed method recently and it worked great. Previously, I had always done it with the engine running.

Originally Posted by five7kid
There are a few different ways to go about it
3) Take off both valve covers, loosen all rockers. Put engine in #1 firing position, tighten all rockers until all slack is gone. Turn engine over 1/2 turn at crank, take all slack out of whatever rockers are loose. Turn over 1/2 turn, take out slack, turn over one more time, take out all slack. Now give each one 1/2 more turn down.
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Old Aug 11, 2008 | 07:16 PM
  #5  
89RsPower!'s Avatar
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Joined: Apr 2002
Posts: 3,552
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From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: Which valves to adjust..

Thanks for the link, that sounds to be the easiest way to do it with it sitting on the stand. Thank you to both of you!
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Old Aug 11, 2008 | 09:42 PM
  #6  
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From: Richlands N.C.
Car: '92 RS
Engine: 350 carb'd
Transmission: T-5
Axle/Gears: 4.10
Re: Which valves to adjust..

I have always had good luck this way.

Turn motor over untill 1 set of valves are closed. Get the pushrods at 0 lash and then give it a 1/4 turn. Repeat for the rest of the cylinders. Always works good for me.
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