08turboZ71

I have a loud knocking noise coming from the top of the motor. Pulled the heads and changed lifters and it didn't help. This is a fresh rebuild and ran good the first few start ups. Has everything new, Ls9 cam and valve springs. You can take the #1 intake rocker off and don't have the noise. If you cut fire to that cylinder, it still knocks only stops if you remove the rocker. Took a video of how it sounds.

Gotit4cheap16

iTrader: (3)

Sounds like a bad rocker to me. Mines recently developed a knock as well but can't figure it out.....

08turboZ71

I did change the rocker and had the same results.

my bandit

iTrader: (10)

I'm very interested to see the outcome of this. I'm dealing with what I think could be the same issue (I'll try to post a video soon also) but everything checked out on my car also. Mines a constant knock like a spun rod bearing but its definitely a top end knock.

08turboZ71

Ended up being 6 wrong rod bolts. But it really sounded like a top end knock. Running good now

74u

iTrader: (9)

Thanks for coming back and posting the final resolution

But...what does that mean? Wrong rod bolt?

Weird that removing a certain rocker arm eliminated a noise downstairs