LT install now valve chatter???

[jpmire]

So I just finished up the install on my LT headers and now I have a pretty loud valve chatter. Or at least that's what I think it is. I installed new gaskets as well as Gasket seat on them before installing the headers. All header bolts have been torqued down. I double checked that its not a leak anywhere. I drove the truck for about 20 minutes and noticed it got a little quieter. That this sound like valve chatter? I just find it odd that I have no problem until I install these headers.

 

[drakon543]

I know you mentioned you found no leaks and I don't mean any disrespect but it seems unlikely it suddenly happened. Maybe it's just leaking in a spot you haven't found yet. A minor leak in the right spot which generally can't be seen or felt for a while can sound a lot like valve chatter. Also after everything has been heated and cooled a few times you will most likely need to retorque the bolts. Keep your eye out for any areas around the meeting points for any black residue building.

 

[BlackOh7on22s]

More then likely its the typical sound it makes when LT's are installed. Many people talk about it on different forums. Mine did same thing when I put long tubes on.

 

[bottomline2000]

Yeah mine is noticeably louder after LTs.. I did actually have a hole in my header pipe and my donuts got cracked. The most obvious sign of a leak was on the freeway in overdrive when I would lug the motor you could hear the tick. It doesn't do it anymore after fixing the head er s and replacing the donuts..definitely retorque the bolts after heat cycling. I have stage 8 bolts but won't put the locks on until everything has seated.

You mentioned gasket seats, what gaskets did u use? GM MLS seem to the best and it's what I'm using.

Only thing left is the y pipe and I had a lot of noise from there. I'm going to try red RTV. A Lotta people say the band clamps don't seal well unless the slip fit is tight. Mine has a good size gap and the clamps don't seal 100%.

 

[01ssreda4]

LTs are super thin, and they let a lot of noise out that the stock manifolds were hiding.