shifter77

my 07 c6 zo6 has a ticking noise at idle. Ive asked the dealer what it was , they said it comes from AR headers.
what say you?

PowerLabs

Substituting the thick heavy cast iron exhaust manifolds for thinwall headers will allow a lot more valvetrain noise to come out. I started noticing it a lot more after my Kooks header install; it sounds like a metallic ticking.

shifter77

That exactly what i was talking about.

Mez

a leaking gasket can also produce a sound like a "tick".

Boomer111

Yup check all the bolts again involved in the exhaust assembly.

sea six

Had the same issue after I installed my Kooks. I guess that is the small price that you pay for the added power.

rws.1

My '08 stock Z has the tick tick tick....

Mez

Does it sound like this?

Mez's engine on YouTube

The ticking or sewing machine sound is from the lifters and/or rocker arms due to the more aggressive cam profile. Not the headers. I did not notice any ticking sounds after the installation of the headers (Dynatech).

TinSecondRice

Mine has the same noise, and my motor is not even the stock motor, but the first time I put it on the lift I could hear it big time and thought something was wrong. After taking a stethoscope to every part of the engine I decided it was just a noise that was resonating out of the headers. It almost seemed like it was coming mostly from the catalytic converters. I have since gutted them and will see if they still make the noise when I get it back together.

Ben Diss

That can come from improperly torqued header bolts. Get your torque wrench and do them all over again. I had the same problem. I was amazed how little torque they require.

Umitaroo

I have the same sound in mycar also ! ..i have asked my dealer about the lifters ?! he said they all sound like this !!
soo what should i do in this case replace the lifters and rockers or what ? please advise ....

jmt1669

Installed my Kooks today and have the same low ticking sound come from the headers, but not a leak.

EuroRod

All LS family of engines are noisy. The coil covers are not there to be pretty, they are accoustic to help reduce the percieved noises.

MarkRx

^^^ only on the 08+ there's a little bit of padding under there.

CMY SIX

OK lets go through this one more time! this is an ALL aluminum engine you will hear things that you never hear in a cast iron motor, the clicks your hearing are the injectors firing

Mez

I agree for stock motors. In my case, when the new cam was installed, the noise was definitely more noticeable. So it probably is both lifters from the cam plus the stock injectors. Funny thing, after a couple thousand miles, the noise has decreased. Weird.