08-21-2020, 02:23 AM | #1 |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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lifter preload
Hello, I am going to be installing some new rocker arms and pushrods (all stock engine) but I keep hearing things like preload or some sort of sequence. I am a little mechanically inclined and I took my engine part but this is my first LS and I was wondering if anyone could give me details on how to install them or explain what preload is and how do I go about it? Or maybe someone has a helpful video link they could share with me?
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08-21-2020, 05:50 AM | #2 |
Drives: 2013 1SS 1LE Join Date: Jun 2016
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Why would you change either of those parts on your engine?
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603 h.p. 495 ft lbs tq. |
08-21-2020, 07:26 PM | #3 | |
Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016
Location: Spring Hill, FL
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Watch this if using stock style LS7 lifters. Aftermarket lifters may require a different preload than stock.
Edit: If you are installing an other than stock ratio rocker arm (1.70:1) then there are other steps that should be taken which aren't explained in that video, ie. checking valve tip sweep pattern.
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Last edited by InFiD3ViL; 08-21-2020 at 07:56 PM. |
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08-23-2020, 08:30 AM | #4 |
old school chevy rodder
Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012
Location: Oregon
Posts: 5,587
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You would be looking for the " golden Zone" for stock lifters on a stock ls engine its .045 to .060 max . LS7 are .070 with different rocker ratio and rev limit. The more preload the more typewriter noise but also better for accidental over revs if a manual as it better controls the top end... Just some thoughts form a old timer... Good Luck, that and some bushings on the rockers is golden...
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08-23-2020, 09:52 AM | #5 |
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Completely stock engine? Why are you replacing the pushrods and rockers? Unless something is broke, there shouldnt be a need. As far as preload, using stock pushrods wlll set your preload provided you have the stock cam, stock lifters and stock rockers. Rockers are torqued to 22ft lbs. Preload is set with pushrod length. If you change the cam, you will need to measure for new pushrods and calculate preload. Comp has a tool to measure this.
Base circle https://youtu.be/RxGTmlQvzrU Comp tool https://youtu.be/hvBEjeKqktM This should help give a basic understanding even though it's for the LSA engine
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Last edited by FasNuf; 08-23-2020 at 10:09 AM. |
08-23-2020, 10:06 AM | #6 | |
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replaced engine @ 93,000 miles w/ crate engine, camshaft by Comp Cams installed by me, replaced valve train parts, 1.4" BMR lowering springs ZL1 factory rims misc: drilled and slotted rotors, fresh air brake cooling system, new speakers, installed reverse camera, muffler delete |
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08-23-2020, 10:16 PM | #7 |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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I had ticking in my engine even after lifters and stock cam (they were very worn and had pits in them as well as flat spots). So I inspected the pushrods and they were bent so I picked up some new ones and the rocker arms had uneven wearing on some so I picked up some new ones too.
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08-23-2020, 10:18 PM | #8 | |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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08-23-2020, 10:19 PM | #9 |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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Im tired of typing lol, you can see the replies to others on why I was doing this upgrade.
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08-23-2020, 11:53 PM | #10 |
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Sounds like your on top of it maintenance wise. Sounds like you dodged a bullet with thd pitting being on the parts. What mileage on the engine?
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08-24-2020, 08:00 AM | #11 |
Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019
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There is a push rod length tool pretty cheap for checking what length you need. If you are replacing the rockers with factory rockers you should consider upgrading them with a CHE bushing trunnion upgrade, or BTR V2 trunnion kit. If staying with stock parts you won't need to check the length just torque the rockers down as mentioned above.
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08-25-2020, 12:43 AM | #12 |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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08-25-2020, 12:44 AM | #13 | |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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08-25-2020, 08:38 AM | #14 | |
Drives: 2012 Camaro SS 45th Anniversary Join Date: Aug 2020
Location: Houston
Posts: 60
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Tags |
arm, lifter, ls3, preload, rocker |
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