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what is causing the need for shorter pushrods?

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Old Mar 14, 2015 | 08:24 PM
  #21  
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Originally Posted by zildjian4life218
Could the lifters be messed up? At TDC between compression and power strokes I can see the pushrod for the intake is much higher than the exhaust one and I have swapped both pushrods and rocker assemblies. #1 exhaust measured fine...... I have only been checking #1 intake. #6 exhaust is fine. #6 intake is not
I would turn the crank an additional 90 degrees and see if the intake pushrod is still higher than the exhaust pushrod. If not, then the cam is probably not installed properly. If so, then I give up.
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Old Mar 15, 2015 | 06:56 AM
  #22  
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7.290" gives you about 0.100" preload, which is what I have measured on several stock motors.

How much was the motor disassembled prior to you installing the pushrods?
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Old Mar 15, 2015 | 07:42 AM
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Originally Posted by vettenuts
Also, do they initially compress and then the valves close or do they stay open? When you first torque the rockers in place, they will open the valves a bit until the lifter bleeds down. That may be what you are seeing assuming you are doing this by the correct procedure, i.e., both lifters are on the base circle of the cam.
Correct!
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Old Mar 15, 2015 | 11:29 AM
  #24  
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okay.... so I don't know what happened. I was looking through a couple forums and one response I read someone ended up saying "F*** it. Zero lash them, run the motor for 5 minutes and if it blows ill rebuild it." Ran the motor for about 5 minutes at zero lash on the rockers that were opening the valves and now we are able to torque all the rocker arms to the 22 Ft lbs without opening the valves while doing each cylinder 1 by 1.....

I am so confused as to what changed but It all appears to be adjusted correctly now. I do not know if something was hanging up in the lifter causing issues but I have oil on all the rockers. I will keep an eye on it after the engine and clutch break in and make sure everything looks good still.

Thanks for all the input everyone.
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