LT4 Rocker Noise
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
To summarize, I had noisy valves on what sounded like #6 and #8. Using new LT4 rockers, springs, etc. Swapping rockers side to side made no difference. So I pulled the lifters and installed a new set. Now, both sides of the engine sound the same. I still have rocker noise, but now it sounds normal to me and not excessively noisy.
When I find time in the next couple of days I'll plug in my laptop and see if the knock sensors are still picking up the rockers. I hope not. I tried the LT4 knock module but it made the false knock MUCH worse. So unless I have a bad LT4 KM the LT1 KM is the one for me.
Le Mans Master
Joined: Apr 2000
Posts: 5,589
Likes: 0
From: DrunkDefender
CI 1-2-3-4-5-6-7-8 Veteran
CI-IV AutoX Champ
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St. Jude Donor '07-'10
From what you described it sounds like normal noise but check your vin against this http://www.grandsportregistry.com/te...rarmrecall.htm
to make sure it doesnt fall under the recall. There was a recall on a few early LT4s for failed RR. Most of em have been corrected by now though.
to make sure it doesnt fall under the recall. There was a recall on a few early LT4s for failed RR. Most of em have been corrected by now though.
Heel & Toe
Joined: Apr 2003
Posts: 21
Likes: 0
From: Salisbury Md
I have an lt4 and have that ticking noise. I took it to a friend and a very good mechanic. He said lifters. He is going to replace for me at the end of the month. Also how much would replacing lifters roughly cost if done at a shop. We talked a little about performance roller rockers and he said it might pull out another 10-15 hps. If he does the new roller rockers will a retune need to be done? Any other ideas performance mods anyone might suggest while he is in there. Thanks in advance.
Thread Starter
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
From what I understand, our rollers are pretty stout as it is. They are Crane Cams Aluminum rockers. I believe that they are sold by Crane as an aftermarket upgrade. Honestly. I am beginning to think my "noise" is more exhaust related. I think that after I did the muffler elims I am just hearing the good ole' LT4. Now, if your in there, theres a guy on this forum with a hot cam at a good price.
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 2
From: Cincinnati Oh
From what you described it sounds like normal noise but check your vin against this http://www.grandsportregistry.com/te...rarmrecall.htm
to make sure it doesnt fall under the recall. There was a recall on a few early LT4s for failed RR. Most of em have been corrected by now though.
to make sure it doesnt fall under the recall. There was a recall on a few early LT4s for failed RR. Most of em have been corrected by now though.
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
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Melting Slicks
Joined: Sep 2003
Posts: 2,270
Likes: 118
From: N. Babylon NY
STILL noisy
. The rockers were hitting the valve covers (I did grind off the drip tabs-maybe not enough) I think they were also rubbing the boss for the center-bolts)-so I changed them with taller covers (Proform brand).It does run fine...I will just have to live with the noise.
Steven
Instructor
Joined: Mar 2007
Posts: 170
Likes: 0
From: PORT JEFFERSON LONG ISLAND
Not to scare anyone but I had a 1996 LT1 with about 93,000 mile and started to get a little lifter noise. That soon turn into a cherping sound. sounded like a bird under the hood. Track down the noise to the number 7 cylinder vavle train. The roller on the lifter had developed pitts and nicks all the way around it the cam felt smooth but it was hard to tell if it was damaged. I changed it out and have put about 700 mile and with no issues. I am keeping my fingers crossed that it does not come back.
Perry
Perry
