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LS1 Valve adjustment Procedure????

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Old Apr 15, 2006 | 08:30 PM
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Default LS1 Valve adjustment Procedure????

Can anyone tell how to adjust my valves. Its a 2004 corvette and the torque specs. are 22lbs on the rocker arms......the car keeps having a rough idle and pings. Can anyone help?????
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Old Apr 15, 2006 | 08:35 PM
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If it's stock, that's all you can do, tq to 22 ft. lbs. Did you check for a bent PR? Other maintenence stuff? Plugs? Wires? Fuel filter?
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Old Apr 15, 2006 | 08:36 PM
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Do the rockers keep coming loose? is that what is causing the pinging?
Or are you just guessing?

If they keep coming loose, try putting some blue loctite (medium strength) on the threads of the bolts that hold the rockers down.
Torque them to 22 lbs. Crank the engine over by hand a few times, then re-torque them all again. you should be good to go.

The ls1 stock rockers are non-adjustable.
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Old Apr 15, 2006 | 08:40 PM
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My rockers are not coming loose just my guess of whats wrong I just rebuilt the motor with new forged pistons it ran fine for about 200 miles and it started pinging under a load and back firing and not wanting to idle...just dies.....also no bend rod...
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Old Apr 15, 2006 | 08:43 PM
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Did you change anything else besides pistons? Are the pistons flat tops? Domes? Did you change heads? I'm wondering if you did anything that would require tuning.
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Old Apr 15, 2006 | 08:44 PM
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I just changed the pistons from flat top to a -2cc flat top....Dont understand how it went almost 200 miles before it messed up?
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Old Apr 15, 2006 | 08:46 PM
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2004 Corvette and you just rebuilt the motor and you're guessing that the problem is valve adjustment. Sounds like there is more going on. Maybe more info' about the history might help some of the guru's here to lend a hand.
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Old Apr 15, 2006 | 08:47 PM
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Maybe it's not related to the rebuild at all, maybe you have one or more injectors on the way out, or something esle with the fuel system. You could try a filter first and see what that does for you.
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Old Apr 15, 2006 | 08:50 PM
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Its a 2004 corvette with 7psi procharger, headers,borla exhaust, 2800 stall, MSD.....everything has been fine untill I cracked a piston .....that began the project to put forged pistons in it.....it has been custom tuned by thunderracing...before the rebuild...after the rebuild it ran for about 200 miles.....NOW the problem begins...?????new plugs,wires,etc...dont know what to do.....
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Old Apr 15, 2006 | 08:51 PM
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I looked for the fuel filter dont know where the @*#& it is......
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Old Apr 15, 2006 | 08:54 PM
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lol, I'm not sure either. On f-body's it's on the body behind the rear passenger seat. Just follow the fuel lines from the tank, you're sure to find it somewhere.

Curious, was it pinging before the rebuild? What was the cause of the cracked piston?
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Old Apr 15, 2006 | 08:58 PM
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It didn't ping before the rebuild.....7psi of boost on stock pistons, stock themostat and wrong plugs...thats bad.
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Old Apr 15, 2006 | 08:59 PM
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Dirty Detonation
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Old Apr 15, 2006 | 09:01 PM
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To trace the fuel lines it gets nasty....you have to removed the x-pipe and some type of skid plate thats between the exhaust and Unidrive train.
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Old Apr 15, 2006 | 09:07 PM
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Well, I did a little reading, you're going to love this... From what I just read the '04's have the filter in the tank...

What plugs are you running now? I think TR6's would be best for that setup.
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Old Apr 15, 2006 | 09:13 PM
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I have the TR6's and....I thought that about the fuel filter......Do you think that is whats wrong with the car??
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Old Apr 15, 2006 | 09:14 PM
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It just doesn't seem like that would be the problem. the car only has 11,000 miles on it.
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Old Apr 15, 2006 | 09:17 PM
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The car also have 38lb injectors in it. which have been running fine and programmed with.....now what would be the best way to determine if its the fuel filter? Maybe check fuel rail pressure?? if so what should it be? if its ok.
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Old Apr 15, 2006 | 09:37 PM
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Is it the stock fuel pump? I honestly don't know much of anything about the vette fueling system, stock on an f-body is 58 psi.
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Old Apr 15, 2006 | 09:41 PM
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As far as I know the fuel pump is stock....But what bothers me the most is before the rebuild it ran fine and after the rebuild it ran fine for 200 miles....nothing fits to me.
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