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never heard til LT install

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Old Apr 4, 2011 | 07:13 AM
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Default never heard til LT install
Finished my header install over the weekend. I can hear my pistons " chunking " and my valves when I give it gas now more than ever. Could hear the motor slightly before, but now its like I can hear the parts moving like im in the motor. I dont know, hard to explain. But, is this normal audio from the motor after LT install.
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Old Apr 4, 2011 | 08:07 AM
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Maybe, sound is so subjective. Those primaries are much thinner than stock manis....mine was louder in the engine post LT install.
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Old Apr 4, 2011 | 08:12 AM
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^ That's what I was thinking this was too. You can hear the "clinking" sound more on headers because the metal is thinner. On stock manifolds you have a good "wall" of cast iron holding the noise in. This thread jogged my memory. You get used to the extra noise after a while. Get a loud catback and you won't hear it anymore.
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Old Apr 4, 2011 | 09:49 AM
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Originally Posted by bayer-z28
^ That's what I was thinking this was too. You can hear the "clinking" sound more on headers because the metal is thinner. On stock manifolds you have a good "wall" of cast iron holding the noise in. This thread jogged my memory. You get used to the extra noise after a while. Get a loud catback and you won't hear it anymore.
exactly....
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Old Apr 4, 2011 | 10:32 AM
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I think this is where our cars get the "sowing machine" description from. Mine has it as well.
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Old Apr 4, 2011 | 11:20 AM
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^ Sewing machine is different. That's valve train noise after a cam install.

Ex: This is a knock video for reference, but the sewing machine noise is always there.
http://www.youtube.com/watch?v=CfNfdj-wtt8
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Old Apr 4, 2011 | 11:55 AM
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piston slap was more noticable on mine after header install, especially when cold.
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Old Apr 4, 2011 | 12:04 PM
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Yup me too, nothing to worry about.
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Old Apr 4, 2011 | 12:35 PM
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I have I think the loudest setup possible . LT, true dual, lm1's, x pipe, magnaflow cats.
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Old Apr 5, 2011 | 09:11 AM
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Is the sewing machine noise that windy kinda noise you hear when you give it gas
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Old Apr 5, 2011 | 09:18 AM
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Originally Posted by PheonixLS1
Is the sewing machine noise that windy kinda noise you hear when you give it gas
Never heard a windy noise. Piston slap normally occurs on a cold start. Kind of a "sloppy" sound. If that makes sense?? The sewing machine noise sound like a sewing maching (hence the name). Most people hear it more when they upgrade their cam.
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Old Apr 5, 2011 | 09:20 AM
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^ ^ no.. Sweing machine noise is the tapa-tapa-tapa-tapa-tapa-tapa valve train noise. -only really noticeable after a cam swap.
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Old Apr 5, 2011 | 10:06 AM
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Well thats weird cause I dont have a aftermarket cam and it sounds like a sowing machine to me right now. I guess it will get louder after a cam. But ehh, what do I know...sounds like a sowing machine under the car as well. Guess I beter study the ls1 sound terminology book a little more
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Old Apr 5, 2011 | 10:17 AM
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Originally Posted by senicalj4579
Well thats weird cause I dont have a aftermarket cam and it sounds like a sowing machine to me right now. I guess it will get louder after a cam. But ehh, what do I know...sounds like a sowing machine under the car as well. Guess I beter study the ls1 sound terminology book a little more
I did notice it a little before the cam swap, but it became a lot more noticable afterwards.
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