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What is this knocking noise...lifter?

This is a discussion on What is this knocking noise...lifter? within the Internal Engine forums, part of the LSx Technical Help Section category; ...

  1. #1
    Member GNICTRY's Avatar
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    Question What is this knocking noise...lifter?


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    Senior Member bills98ta's Avatar
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    Might be a bent push rod...

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    TunedbyFrost.com Tuner Frost's Avatar
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    Pull the valve covers and you will likely find whatever it is right in front of you.

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    Member fbodynut's Avatar
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    Quote Originally Posted by GNICTRY View Post
    Does the engine have a hard miss? Like it is not hitting on one cylinder.

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    Member GNICTRY's Avatar
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    Quote Originally Posted by fbodynut View Post
    Does the engine have a hard miss? Like it is not hitting on one cylinder.
    nope

  6. #6
    Senior Member bills98ta's Avatar
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    Unplug the the spark plug wires from the coil packs, uplug the coil main harness, 10mm bolts on the valve covers. Then 8mm bolts to remove the rocker assemblys. Now you just pull out the push rods to inspect them. It's not to bad...
    If that's what it is, I might have some laying around. I will mail a couple, if I can find them !!!

  7. #7
    Member GNICTRY's Avatar
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    thanks guys going to look hopefully tonight...car is not drivable right now-no 3 o 4 in trans...o and it has 104k and i am doing a cam soon so not sure if i should use this block o get a new one from ts

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    Member fbodynut's Avatar
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    Quote Originally Posted by bills98ta View Post
    Might be a bent push rod...
    So are the ls1's know for doing that?
    I'm asking cause, I am still not real familar with these engines.

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    Senior Member bills98ta's Avatar
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    Ya, The stock valve springs & push rods are the weak link... It's real easy to float out the valves, causing bent valves too... After I bent a few, I installed comp cam bee hive springs & magnum rods.

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    Member GNICTRY's Avatar
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    should i go with a new block when i install cam or will the stock bottom end stuff-bearing/pistons... be okay...fyi it had been running lean when i bought it and then i got it tuned by frost in 07...not sure if it cause any damage???

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    Senior Member bills98ta's Avatar
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    The block is most likely fine ! I ran my stock bottom w/ a big cam & a 150 dry shot for 4 years !!! That motor got me into the high 10's !
    Actually, I got on ebay and bought a block & crank for a future build, "but", I popped my motor & am rushing the new build now !!! I'm hoping my old block is OK for a spare build !!!

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    Member fbodynut's Avatar
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    Quote Originally Posted by fbodynut View Post
    So are the ls1's know for doing that?
    I'm asking cause, I am still not real familar with these engines. ng
    Dang, I really need to use the spell ck. Sorry.

    I guess I thought the rev limiter would keep things below the damage range.
    I try not to let mine rev that high anyway. Sure could use a good excuse for new head set up though. lol

  13. #13
    Senior Member bills98ta's Avatar
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    Quote Originally Posted by fbodynut View Post
    Dang, I really need to use the spell ck. Sorry.

    I guess I thought the rev limiter would keep things below the damage range.
    I try not to let mine rev that high anyway. Sure could use a good excuse for new head set up though. lol
    If you really want a good excuse, come on up !!! I have HP tuners, & we can set the rev limit to 9K !!! LOL !!!
    Really though, I have mine at 7400 and shift at 6800, & almost hit 7K at the finish line. I use the HP recorder to play back my passes. It's pretty cool !

  14. #14
    Senior Member bills98ta's Avatar
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    Wow, I just noticed that every one on this thread, besides me, is from Virginia ! Any of you race Mason Dixon ???

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    Member fbodynut's Avatar
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    9k and we might be talking new motor! 6 liter here we come!!
    Anything above 6k makes me nervous on a street motor, Well, except for a bike maybe.
    That thing must be humming crossing the line at 7k. And sounds good too, I bet !

  16. #16
    Something Diabolical... chuckie669's Avatar
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    6800, wow. Post up a clip of that.

  17. #17
    Senior Member bills98ta's Avatar
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    Here's a 11.05 pass that my buddy Mark took. Hot, Humid, & a little slower day, but still consistant !!!


  18. #18
    Senior Member bills98ta's Avatar
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    Here's a 10.77 pass on Marks SS, Which also has a stock bottom end !


  19. #19
    Senior Member bills98ta's Avatar
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    I just found his 10.13 pass too !!! ( he's faster than me ) LOL


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    Senior Member 01ws6er's Avatar
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    That is pretty close to the sound mine makes, but no bent pushrods or broken rockers or valve springs for me...I'm 99.9% sure it's a lifter in my case cause I've already eliminated all of the other valvetrain variables. My car used to make the sound only as rpms increased, but now it does so at all rpms and idle, and it's starting to miss a little.

    Definately pull the valve covers and take a look!

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