I used to have a 00 Z with an Ls1 stock intake,sounded quite and dont remeber it making a sound at all.I since then have swapped my old camaro's motor into my current vehicle a 01 formula.I installed a used Ls6 intake on it.It runs fine but man does it sound diffrent.It makes this little sump,sump,sump,noise.Sounds like a sucking noise I think.Can you guys tell me if this is normal?I heard my buddies non Ls6 intake sound quiter,what do you think?

Again little noise that goes

sump,sump,sump,sump,and on till you turn the car off.

 

I just installed the LS6 intake on my 98 M6 and it did change the way the car sounded. I dont however have in abnormal sounds like you are desribing. I would probably check to see if is sealed or if you left one of the vacuem lines loose.

 

Every thing is pluged in right.Doubled checked all the vacumm hoses too.Know I also have another question should I have replaced the intake gaskets?I didn't.I mean the car runs and works.Just a little noisier.

 

Well how is the idle ?? It could be due to the fact that you did not change the intake gasket... I am not too certain about the LS1 and other Gen 3 Small Blocks but I do know for a fact that if you tried to reuse the intake gasket on an older small block, then you are going to experience a vacuum leak and more noise then normal...

Charlie

 

Anytime you are changing a part that requires a gasket, always replace it with a new one.
Especially on things like Heads, intake manifolds, exhaust manifolds, etc......
That might be the cause of that sound.

 

I agree w/ you GoFast908Z, I do know to change any gasket but I have been flamed before when adding some advice before... That is why I said I am not too sure because of not wanting a flame war... I can say that for examle if you switch to headers and use Copper Gaskets, you don't have to change the copper gaskets if you ever remove your headers, to say for example to swap out heads!!

Charlie

 

Great I'll just swapp this intake gaskets out with some new ones.I should have changed them but I was told they would be okay.So I left them alone.How much are they?

 

The gaskets are rubber and also the intake bolt torque spec is very low. I have re-used ls-6 intake gaskets couple of times without problems. If the idle is stable and normal rpm I bet the sound you're hearing is injector noise.

 

No its not the injectors.Its the intake making some sucking noise..My buddy told also told me if the idle is fine and it doesn't stumble when the car is started dont mess with it.It runs fine its just that I dont know if this is a normal sound.Maybe I can get a recording of it and posted up.