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Adjusting stock rockers

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Old 08-24-2008, 10:04 PM
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Default Adjusting stock rockers

Just to be sure. You just tighten all the rockers to 22ft.lbs regardless of lobe position right? I just took my rockers and pushrods out to inspect them but didnt rotate the engine at all.


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Old 08-25-2008, 04:30 AM
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Here it is:

Old 08-25-2008, 06:47 AM
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I should have been more clear I didnt take all of them off just the passengers side and didnt move anything. Still have to do all that?

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Old 08-25-2008, 06:54 AM
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Man, I guess I did mine wrong then. I just left the timing chain dot to dot & dropped in the pushrods then rockers. Tightened them all down one side at a time. I haven't had a single issue yet & it's been together for a year of daily driving.

And stock rockers aren't adjustable just incase you didn't know for sure.
Old 08-25-2008, 07:20 AM
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Stock rocker system is a MUCH easier ordeal then with the GEN I and GEN II motors.
Old 08-25-2008, 07:23 AM
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The procedure is designed so there is less stress and tension on the parts while tightening. If you are up on the lobe, you must overcome the spring pressure while torqueing the bolt. If your are not going to rotate the engine per the instructions, after you slowly tighten each rocker to 22 lb ft, disable the fuel pump and crank the engine at least one revolution to check the movement of the rockers and then re-torque each one.
Old 08-25-2008, 09:17 AM
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Originally Posted by 69LT1Bird
The procedure is designed so there is less stress and tension on the parts while tightening. If you are up on the lobe, you must overcome the spring pressure while torqueing the bolt. If your are not going to rotate the engine per the instructions, after you slowly tighten each rocker to 22 lb ft, disable the fuel pump and crank the engine at least one revolution to check the movement of the rockers and then re-torque each one.
This is what I was thinking. Tighten each one slowly, rotating the crank 360 degrees a couple times until I have gone through them all.
Old 08-25-2008, 09:24 AM
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If the rockers arent torqued right, could there be a loss in power?
Old 08-25-2008, 11:11 AM
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Originally Posted by TA1364
If the rockers arent torqued right, could there be a loss in power?
You need to define "aren't right". If the rocker is bottomed and the bolt tight enough to keep it there, then the rocker should perform correctly with no power loss. If it is physically loose, then it won't.

The GM procedure, from what I can tell, is done the way it is for two reasons. First, it provides better and consistent preload of the bolt. Second, it prevents driving the valve into the piston on any cylinder whose piston is at the top since the lifter won't bleed fast enough and the valve will instead open.




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