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

pushrod lifter and rocker combo information.

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Old May 1, 2013 | 06:33 PM
  #16  
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Re: pushrod lifter and rocker combo information.

Originally Posted by ussj4brolli
Understood. I will be ordering the ultra rr and the ls7 lifters then along with the push rod length checker and a sharpy LOL
An excellent plan.
Old May 2, 2013 | 01:20 AM
  #17  
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Re: pushrod lifter and rocker combo information.

Does that sound like a lifter or rr to you in videos. hope I'm not replacing it for nothing
Old May 2, 2013 | 02:41 AM
  #18  
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Re: pushrod lifter and rocker combo information.

Originally Posted by ussj4brolli
Does that sound like a lifter or rr to you in videos. hope I'm not replacing it for nothing
Actually it does sound like a lifter slapping against the camshaft(1:37 in video). It probably has a flat spot by now. And that squawking sound is the needle bearings grinding on the rollor lifter.

Make sure you check the cam lobe if you find a bad lifter. With the lobe in the up position you don't want to feel anything else but smooth metal all the way across. The roller is not as wide as the lobe so it will be obvious if you need a camshaft too.

Last edited by John95z28; May 2, 2013 at 04:06 AM.
Old May 2, 2013 | 03:31 AM
  #19  
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The roller rockers are worth changing reguardless. Read up on them alot of failures with the proforms from the pin working loose to spitting the bearing out to breaking. Just an inspection under the valve cover may show something. Look for any broken springs too. That squeel very well may be right before spitting something out causing some serious problems. I dont know anything about the lifters except you have to dig deeper to get to them. I also would read up on running without the windage tray(thats a pain to switch pans in car).


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Old May 2, 2013 | 03:48 AM
  #20  
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Re: pushrod lifter and rocker combo information.

I had not seen the second video with valve cover off before. Was that video shot cold? This issue will get worse when warmed up but almost unnoticable cold. It was quiet in the second video and you would expect louder since its open, that is unless cold.

Oh yeah looked at your second video again. That rocker is bone dry right? Number six cylnder. All the others have oil dripping off. Still could be bad lifter not pumping oil, or clogged pushrod but I heard a camshaft in there in the other video.
https://www.youtube.com/watch?v=ZIis...e_gdata_player

Last edited by John95z28; May 2, 2013 at 04:01 AM.
Old May 2, 2013 | 09:49 AM
  #21  
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Re: pushrod lifter and rocker combo information.

Originally Posted by John95z28
I had not seen the second video with valve cover off before. Was that video shot cold? This issue will get worse when warmed up but almost unnoticable cold. It was quiet in the second video and you would expect louder since its open, that is unless cold.

Oh yeah looked at your second video again. That rocker is bone dry right? Number six cylnder. All the others have oil dripping off. Still could be bad lifter not pumping oil, or clogged pushrod but I heard a camshaft in there in the other video.
https://www.youtube.com/watch?v=ZIis...e_gdata_player
Did you watch the whole first video? It's loud as a mf...
When ice cold.its not there sometimes at first start.for about 30 seconds then its there.. sometimes.its there rightnaway. Its Moody about how loud it is.depending on how its driven

Last edited by ussj4brolli; May 2, 2013 at 10:34 AM.
Old May 2, 2013 | 11:51 AM
  #22  
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Re: pushrod lifter and rocker combo information.

Originally Posted by ussj4brolli
Did you watch the whole first video? It's loud as a mf...
When ice cold.its not there sometimes at first start.for about 30 seconds then its there.. sometimes.its there rightnaway. Its Moody about how loud it is.depending on how its driven
Yes, at 1:37-1:43 in the video is when it is captured as the loudest. Classic lifter clacking the cam sound. Classic screaching sound along with it. When the car is cold the oil pressure is enough to make is quiet, but after warm up it will be loud as in your video. A flat spot on the lifter may also make it louder sometimes, and then quieter as the roller spins past the spot or gets stuck on it.
Old May 2, 2013 | 01:43 PM
  #23  
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Re: pushrod lifter and rocker combo information.

Ditto that the present cam is not good for that motor. My CC503 has more lift and duration than what is in that 383. I'm stock short block and stock heads(except for decking the heads) too.

CC503
224/230@0.050 112LSA
Lift = 0.536 intake/0.544 exhaust with 1.6 roller rockers.

Any track times with that combination?

Last edited by ACE1252; May 2, 2013 at 01:49 PM.
Old May 2, 2013 | 03:13 PM
  #24  
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Re: pushrod lifter and rocker combo information.

Originally Posted by ACE1252
Ditto that the present cam is not good for that motor. My CC503 has more lift and duration than what is in that 383. I'm stock short block and stock heads(except for decking the heads) too.

CC503
224/230@0.050 112LSA
Lift = 0.536 intake/0.544 exhaust with 1.6 roller rockers.

Any track times with that combination?
Automatic
13.78 with a opti that died that night and a poor mail tune , street tires and high elevation. Fallon nv. Not great at all Imo.

100 shot and dyno tune after I fix this crap.
Old May 2, 2013 | 06:42 PM
  #25  
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Re: pushrod lifter and rocker combo information.

So today at summit I bought-
Fel-ms95580 intake gasket
Cca-1618-16 rocker arms
Nal-12499225 roller lifters
Cca-152 cam lifter lube
Cca-7702-1 pushrod length checker
Lct-37467 locktight rtv black

Everything I need and correct?
Old May 2, 2013 | 07:43 PM
  #26  
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Re: pushrod lifter and rocker combo information.

Be prepared to replace the cam as well. Lifters don't go bad up top(pushrod side) like that. A leaky lifter that bleeds down through the checkball will clack loud for the first few seconds after start up, but yours was loud after warm up, which indicates a problem on the lower roller side. I really hope it is just a rocker, but the lack of oil indicates a problem down below.
Old May 2, 2013 | 11:21 PM
  #27  
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Re: pushrod lifter and rocker combo information.

Originally Posted by John95z28
Be prepared to replace the cam as well. Lifters don't go bad up top(pushrod side) like that. A leaky lifter that bleeds down through the checkball will clack loud for the first few seconds after start up, but yours was loud after warm up, which indicates a problem on the lower roller side. I really hope it is just a rocker, but the lack of oil indicates a problem down below.
I hope the cam is fine. If not ill drive it tillbshe explodes and get another block. Its a never ending project with both my camaros.

Anyways I have the rockers and the lifters soaking.in 30w oil right now.
Old May 3, 2013 | 09:56 PM
  #28  
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Re: pushrod lifter and rocker combo information.

Took the intake off after work today... about 2.5 hours so far into it. Haven't touched the spider yet. Tomorrow it is! Anyone have some good videos on how to do the adjustments for the lifter and pr like what one to do first second and 16th LOL
Old May 3, 2013 | 11:50 PM
  #29  
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shbox has good info on that. I preferred the individual cyllinder at a time method in car. Just felt it had less chance for error. I also dont spin the pushrod as noticed I wasn't as accurate. The last two times I could find zero lash with just spinning the nut. This last time I did all the exhaust or intake first then the other. Its pretty easy to do your just watching for the pushrod. Just make sure you dont confuse the exhauat with intake side(exhaust always in line with exhaust ports. Shoebox also has that listed. Basicly you get the intake to the correct position then adjust the exhaust side and vise versa for adjusting the exhaust. Your rr should have instructions as well. Once you find vero lash then turn the nut a half turn and tighten the lock. I was able to turn the half turn by hand and keep track easier than with wrench or socket.


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Old May 4, 2013 | 09:33 AM
  #30  
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Re: pushrod lifter and rocker combo information.

I have seen videos where they do both on each cylinder at the same.time. then just fallow.the firing order... all these different ways I'm going to blow.something up....
https://www.youtube.com/watch?v=89o5...e_gdata_player
Or
https://www.youtube.com/watch?v=piif...e_gdata_player
OR
https://www.youtube.com/watch?v=gJMe...e_gdata_player



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