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Generation IV Internal Engine
2005-2010 LS2 | LS3 | LS7 | L92 | LS9
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Old 07-30-2009, 09:46 PM   #1
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Default knocking after cam install..

camshaft-238/242 .581 .581 113lsa comp cam

livernois 7.400 pushrods
livernois valve seals
patriot gold dual valve springs/retainers


i just installed the camshaft today everything went smooth camshaft is dead on i marked the chain in 2 spots, i have done over 100 hemi swaps so i was sure to get the timing dead on..

either way its a loud knock and i can hear it on what i think both sides like a lifter..

5 monthes ago i was driving the car and it just started doing this same sound out of the blue.. then it went away after about 5 minutes of driving..


also when i pull the fuse for the fuel pump and crank it over with no fuel and just the starter it makes no noise..

any ideas?

i have a vid coming
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K*N intake
true dual 3 inch

gm stage 2 227/239 .551/.551 112+4 to be installed
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Old 07-30-2009, 09:48 PM   #2
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Quote:
Originally Posted by 400rwhphemi View Post
Car-2005 gto
camshaft-238/242 .581 .581 113lsa comp cam

livernois 7.400 pushrods
livernois valve seals
patriot gold dual valve springs/retainers i didnt use any shims


i just installed the camshaft today everything went smooth camshaft is dead on i marked the chain in 2 spots, i have done over 100 hemi swaps so i was sure to get the timing dead on..

either way its a loud knock and i can hear it on what i think both sides like a lifter..

5 monthes ago i was driving the car and it just started doing this same sound out of the blue.. then it went away after about 5 minutes of driving..


also when i pull the fuse for the fuel pump and crank it over with no fuel and just the starter it makes no noise..

any ideas?

i have a vid coming


also forgot to add that i took the drivers side valve cover off and had someone watch the lifters.. they are all moving..
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2005 gto
kooks 1 7/8 long tubes w/ flowmaster 10's
K*N intake
true dual 3 inch

gm stage 2 227/239 .551/.551 112+4 to be installed
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Old 07-30-2009, 10:19 PM   #3
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I see the problem in your sig, you have a flowmaster.... jk could be a rocker arm not torqued all the way or could be a bad lifter i guess. Did you replace them?
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Old 07-30-2009, 10:37 PM   #4
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no i didnt... they where fine for the last 8k miles..
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kooks 1 7/8 long tubes w/ flowmaster 10's
K*N intake
true dual 3 inch

gm stage 2 227/239 .551/.551 112+4 to be installed
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Old 07-30-2009, 11:44 PM   #5
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I assume you installed new seals with the Springs also? Are you using the stock rocker arms?
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Old 07-30-2009, 11:54 PM   #6
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did you check the pass side? Dont know if I missed that. Just to make sure a spring didnt pop. Also why not some HP behives with that cam. Maybe spin the crank by hand could help determine where its at. Hope you find it.
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Old 07-31-2009, 06:51 AM   #7
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You said it stopped when you disabled the fuel pump, you may have an injector knocking. Unplug one injector at a time to see if it goes away.
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Old 07-31-2009, 08:55 AM   #8
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thanks for the tips guys.. i never unplugged the injectors..

i did install brand new seals from livernois they were just a press on type seal went on pretty hard..

also im thinking now that maybe the pushrods are to long..

cam is ground on the xer lobes..

yes stock rocker arms also..
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2005 gto
kooks 1 7/8 long tubes w/ flowmaster 10's
K*N intake
true dual 3 inch

gm stage 2 227/239 .551/.551 112+4 to be installed
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Old 07-31-2009, 05:02 PM   #9
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It doesn't matter if they got unplugged or not, the noise is a hammering type sound from an injector that has a problem, just something easy to check.
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Old 08-01-2009, 01:14 AM   #10
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how much preload?
7.425's may be needed
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Old 08-02-2009, 12:54 PM   #11
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Quote:
Originally Posted by 1BADAIR View Post
how much preload?
7.425's may be needed
yea sounds like rocker noise
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2005, cam, camshaft, gold, gto, install, installing, l76, l92, lifter, noise, patriot, springs, swap, valve


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