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top end knock

This is a discussion on top end knock within the Internal Engine forums, part of the LSx Technical Help Section category; hey guys-- i got a top end knock in my 00 ss with 44k ive been told its a lifter. ...

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    top end knock

    hey guys-- i got a top end knock in my 00 ss with 44k ive been told its a lifter. I removed the valve covers and pulled all the pushrods out hoping to find one bent But they seem to be fine. does the heads need to come off to change the lifters ? does anybody know of a speed shop in the kansas city area that could work on this thing ? im dont want to pull these heads off myself and i figure if i can find someone to fix the lifters than maby ill goahead and put a cam in it. thanks

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    Senior Member INMY01TA's Avatar
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    List your mods, this may help.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Yes, the cylinder heads need to come off to change the lifters.

    Does the knock come and go or is it sometimes worse then seems to back off?

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    its got slp long tubes with loudmouth slp mas lid and bellows. hypertech programer and stat centerforce clutch and flywheel and thats about it. it makes the noise all the time no matter if it cold or hot. the faster you rev it the faster it taps. it sounds like its coming right from under the intake.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    My lifters are getting worse and I am replacing them w/ LS7's and throwing on Trickflow heads since I gotta yank the originals. Make sure you get new cups.

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    Senior Member INMY01TA's Avatar
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    If it's a tap like you say then prolly is a lifter, I wouldn't drive it. If it's just a ticking I wouldn't worry about it. Either way I'd lose the Hypertech.

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    do you guys know any one in kansas city area that could work on this damn thing ? i dont wanna take these heads off myself. ill haul it to st louis springfield ect if i have to.

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    Member GNICTRY's Avatar
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    not to steal thread but i just did my cam/ls7 lifter...ect about 7k ago..due to lifter knock...will its back but on pass. side...so if i took it back apart and replace the trays for lifters since i didnt...dumb me.. do yall think cam/lifters will be fine and not knock as long as they check out visually??

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by GNICTRY View Post
    not to steal thread but i just did my cam/ls7 lifter...ect about 7k ago..due to lifter knock...will its back but on pass. side...so if i took it back apart and replace the trays for lifters since i didnt...dumb me.. do yall think cam/lifters will be fine and not knock as long as they check out visually??
    The trays could cause this, but I would lean towards something else.

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    Senior Member 01ws6er's Avatar
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    I have a tap that is very intermittent...I think it is a lifter on my pass side, but I don't care because it just sounds like loud piston slap, and goes away after a few min...I'm waiting until winter when i do a cam swap and I'm just gonna pull the heads and swap them then.

    Brandon, where did you buy the lifter trays and why do you need to swap them?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by 01ws6er View Post
    I have a tap that is very intermittent...I think it is a lifter on my pass side, but I don't care because it just sounds like loud piston slap, and goes away after a few min...I'm waiting until winter when i do a cam swap and I'm just gonna pull the heads and swap them then.

    Brandon, where did you buy the lifter trays and why do you need to swap them?
    I got the lifter trays from GM through my work. They keep the lifter in line so that it deos not turn. They are about $3 each x4 and well worth it to avoid any possible problems.

    That exhaust will sound even meaner with a nice cam!

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    Senior Member 01ws6er's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    I got the lifter trays from GM through my work. They keep the lifter in line so that it deos not turn. They are about $3 each x4 and well worth it to avoid any possible problems.

    That exhaust will sound even meaner with a nice cam!
    Thanks, I'll call Fred Beans when I get ready to do this then.

    Have you seen my new exhaust setup yet? It's posted in the True Dual Read Me sticky! If I'd have known you were selling that true dual pypes setup I would have bought that and had it modified to fit...!!! Oh well.

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    Quote Originally Posted by 01ws6er View Post
    Thanks, I'll call Fred Beans when I get ready to do this then.

    Have you seen my new exhaust setup yet? It's posted in the True Dual Read Me sticky! If I'd have known you were selling that true dual pypes setup I would have bought that and had it modified to fit...!!! Oh well.
    Hell yeah, I've seen it! It looks and sounds great!
    Last edited by 9t8z28; 09-23-2008 at 06:46 PM.

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    Quote Originally Posted by 01ws6er View Post
    Thanks, I'll call Fred Beans when I get ready to do this then.

    Have you seen my new exhaust setup yet? It's posted in the True Dual Read Me sticky! If I'd have known you were selling that true dual pypes setup I would have bought that and had it modified to fit...!!! Oh well.
    Opps! I haven't been in that TD thread for a while. Last I saw, you had the TD's dumped, but I just looked in the thread and it looks good!

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    check your header bolts some times a header leak can sound like a lifter tapping of even a rod bearing going out.

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    Quote Originally Posted by 9t8z28 View Post
    The trays could cause this, but I would lean towards something else.
    what else should i look at?

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    well... are have you used a stethascope yet to really listen??? if not use a long screw driver and put the handle to your ear... works jsut like a steth...

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    Quote Originally Posted by GNICTRY View Post
    what else should i look at?
    Did you have your pushrod length checked?

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    no how do you check the length ? how much does it cost just to replace them ? if it is the lifter does it hurt to drive it? should the thing run bad if it was a lifter ?

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    Quote Originally Posted by 9t8z28 View Post
    Did you have your pushrod length checked?
    i put the texas speed 7.4 standard hardened puch rods in it...its pak 2 on site

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