[Z06] LS7 broken rocker arm needle bearings issue
04-06-2008, 03:23 AM
#1
Racer
Thread Starter
LS7 broken rocker arm needle bearings issue
This thread is to collect information on this issue and have people that have had this happen to their car report it here to try to gauge how widespread the issue is.
There are not that many that have had this happen, but for those that it has happened to it can be a painful experience and disappointing experience.
Please post to this thread if you have had this happen or if you have good info to share!
The one thing I really would like to see you post is what year and month your car was built.
Edit April 2011: I am not going to update the list any more, but do appreciate it if you post to the thread if you run into this issue so we can continue to keep an eye on it and inform people, especially those that are buying a used Z06 produced in the higher failure rate time-frame.
Also, if you do find roller bearings when changing your oil, be aware that in addition to the rocker arm failure there may be damage to the valve stem end as seen here
-kg
There are not that many that have had this happen, but for those that it has happened to it can be a painful experience and disappointing experience.
Please post to this thread if you have had this happen or if you have good info to share!
The one thing I really would like to see you post is what year and month your car was built.
Edit April 2011: I am not going to update the list any more, but do appreciate it if you post to the thread if you run into this issue so we can continue to keep an eye on it and inform people, especially those that are buying a used Z06 produced in the higher failure rate time-frame.
Also, if you do find roller bearings when changing your oil, be aware that in addition to the rocker arm failure there may be damage to the valve stem end as seen here
-kg
Last edited by KGjevre; 06-13-2011 at 05:14 PM. Reason: update with valve stem issue link
04-06-2008, 03:24 AM
#2
Racer
Thread Starter
The list:
James E...... - 2007 Z06 - built JAN 07 - ______ @ 3450 (one rocker starting to fail, engine built 1/7/07)
KGjevre...... - 2007 Z06 - built JAN 07 - intake @ 3797 (cyl #7 & #8, stock, 1st oil change, engine built 1/22/07)
jan eric..... - 2007 Z06 - built JAN 07 - ______ @ ____
tigerwho..... - 2007 Z06 - built JAN 07 - ______ @ 4800 (all rockers with excessive play)
Pistol Champ. - 2007 Z06 - built JAN 07 - ______ @ 5000
Av8terZ06.... - 2007 Z06 - built JAN 07 - intake @ 2846 (cyl #8)
ronin8181.... - 2007 Z06 - built FEB 07 - ______ @ 3226 (dealer found no broken rocker arm...)
Pkw333....... - 2007 Z06 - built FEB 07 - ______ @ ____ (other forum)
Tamulinas2... - 2007 Z06 - built FEB 07 - intake @ 3266 (cyl #8, deliv. MAR so est. FEB build)
Cloaked...... - 2007 Z06 - built MAR 07 - intake @ ____ (cyl #2)
No Doubt..... - 2007 Z06 - built MAR 07 - intake @ 5400 (cyl #7, other forum, engine built 2/21/07)
Bigbucks..... - 2007 Z06 - built MAR 07 - intake @ ____ (one failed, one about to fail, car buit 3/15/07)
jbp8653...... - 2007 Z06 - built MAR 07 - in&exh @ 9900 (intake failed, exhaust about to fail)
greendot..... - 2007 RFZ - built MAR 07 - ______ @ 5800
Ken Olson.... - 2007 Z06 - built MAR 07 - ______ @ 6000 (dealer replaced 3 rocker arms)
90sundevil... - 2007 Z06 - built MAR 07 - ______ @ 6500 (5th one with same issue at this dealer)
ryuz06....... - 2007 Z06 - built MAY 07 - intake @ 12000 (stock, 2nd oil change)
Patsfan67.... - 2007 Z06 - built JUN 07 - ______ @ ____
NavyVet...... - 2007 Z06 - built JUN 07 - intake @ 2500 (cyl #5 & #6)
Beast350..... - 2007 Z06 - built JUN 07 - intake @ 8000
08 Z06....... - 2008 Z06 - built JUL 07 - intake @ 7500 (other forum - Note that this is a 2008, with engine built June 07)
amg destroyer - 2007 Z06 - built ______ - ______ @ 2000 (other forum, one rocker arm replaced)
AtomicZ...... - 2007 Z06 - built ______ - ______ @ ____
NOSZ06....... - 2007 Z06 - built ______ - intake @ 3000 (cyl #6)
RichieRichZ06 - 2007 RFZ - built ______ - ______ @ ____ (customer's/"her" car)
roadking se.. - 2007 Z06 - built ______ - ______ @ 3000 (sold)
silver93vert. - 2007 Z06 - built ______ - ______ @ ____ (boss' car)
Z06Norway.... - 2007 Z06 - built ______ - ______ @ ____ (cyl #8)
Gene R....... - 2007 Z06 - built ______ - intake @ 6300 (3 failed, dealer dropped pan, cut oil filter open, replaced all rocker arms)
Total=29
This list is not up to date any more, but there has been a slow trickle of more cars that have the issue that I have seen posted to this thread. It is still largely confined to the above time-frame, with the much more unusual but still expected additional failures popping up now and then.
James E...... - 2007 Z06 - built JAN 07 - ______ @ 3450 (one rocker starting to fail, engine built 1/7/07)
KGjevre...... - 2007 Z06 - built JAN 07 - intake @ 3797 (cyl #7 & #8, stock, 1st oil change, engine built 1/22/07)
jan eric..... - 2007 Z06 - built JAN 07 - ______ @ ____
tigerwho..... - 2007 Z06 - built JAN 07 - ______ @ 4800 (all rockers with excessive play)
Pistol Champ. - 2007 Z06 - built JAN 07 - ______ @ 5000
Av8terZ06.... - 2007 Z06 - built JAN 07 - intake @ 2846 (cyl #8)
ronin8181.... - 2007 Z06 - built FEB 07 - ______ @ 3226 (dealer found no broken rocker arm...)
Pkw333....... - 2007 Z06 - built FEB 07 - ______ @ ____ (other forum)
Tamulinas2... - 2007 Z06 - built FEB 07 - intake @ 3266 (cyl #8, deliv. MAR so est. FEB build)
Cloaked...... - 2007 Z06 - built MAR 07 - intake @ ____ (cyl #2)
No Doubt..... - 2007 Z06 - built MAR 07 - intake @ 5400 (cyl #7, other forum, engine built 2/21/07)
Bigbucks..... - 2007 Z06 - built MAR 07 - intake @ ____ (one failed, one about to fail, car buit 3/15/07)
jbp8653...... - 2007 Z06 - built MAR 07 - in&exh @ 9900 (intake failed, exhaust about to fail)
greendot..... - 2007 RFZ - built MAR 07 - ______ @ 5800
Ken Olson.... - 2007 Z06 - built MAR 07 - ______ @ 6000 (dealer replaced 3 rocker arms)
90sundevil... - 2007 Z06 - built MAR 07 - ______ @ 6500 (5th one with same issue at this dealer)
ryuz06....... - 2007 Z06 - built MAY 07 - intake @ 12000 (stock, 2nd oil change)
Patsfan67.... - 2007 Z06 - built JUN 07 - ______ @ ____
NavyVet...... - 2007 Z06 - built JUN 07 - intake @ 2500 (cyl #5 & #6)
Beast350..... - 2007 Z06 - built JUN 07 - intake @ 8000
08 Z06....... - 2008 Z06 - built JUL 07 - intake @ 7500 (other forum - Note that this is a 2008, with engine built June 07)
amg destroyer - 2007 Z06 - built ______ - ______ @ 2000 (other forum, one rocker arm replaced)
AtomicZ...... - 2007 Z06 - built ______ - ______ @ ____
NOSZ06....... - 2007 Z06 - built ______ - intake @ 3000 (cyl #6)
RichieRichZ06 - 2007 RFZ - built ______ - ______ @ ____ (customer's/"her" car)
roadking se.. - 2007 Z06 - built ______ - ______ @ 3000 (sold)
silver93vert. - 2007 Z06 - built ______ - ______ @ ____ (boss' car)
Z06Norway.... - 2007 Z06 - built ______ - ______ @ ____ (cyl #8)
Gene R....... - 2007 Z06 - built ______ - intake @ 6300 (3 failed, dealer dropped pan, cut oil filter open, replaced all rocker arms)
Total=29
Last edited by KGjevre; 06-13-2011 at 05:20 PM.
04-06-2008, 03:39 AM
#3
Racer
Thread Starter
How to find your car's build month:
Look at the back of the driver's side door:
How to get your car's build date:
Email Betty@corvettemuseum.com with you VIN (at least that was the case when I got mine back in Feb 07).
How to get your engine’s build date:
Look up the engine number (instructions here) and then post it to the same thread and someone hopefully will respond with the engine build date, or calculate it yourself from this info:
The engine number looks like this 10zld xLDDDxYBB
The second digit is the line number (L).
The 3rd, 4th, and 5th number is the day of year (DDD).
The 7th number is the year (Y).
The last 2 numbers are the engine built of the day number (BB).
To turn the day-of-year number into a date you can use this link: http://www-air.larc.nasa.gov/tools/jday.htm
Does your car have the magnetic drain plugs?
If you search you will find lots on info on this, but I think it can be sumarized as:
- 2006 Z06 does not have magnetic drain plugs (except for maybe late build ones).
- 2007 Z06 has magnetic drain plugs
- 2008 Z06 has magnetic drain plugs until it was deleted from the build sometime in January 08.
Look at the back of the driver's side door:
How to get your car's build date:
Email Betty@corvettemuseum.com with you VIN (at least that was the case when I got mine back in Feb 07).
How to get your engine’s build date:
Look up the engine number (instructions here) and then post it to the same thread and someone hopefully will respond with the engine build date, or calculate it yourself from this info:
The engine number looks like this 10zld xLDDDxYBB
The second digit is the line number (L).
The 3rd, 4th, and 5th number is the day of year (DDD).
The 7th number is the year (Y).
The last 2 numbers are the engine built of the day number (BB).
To turn the day-of-year number into a date you can use this link: http://www-air.larc.nasa.gov/tools/jday.htm
Does your car have the magnetic drain plugs?
If you search you will find lots on info on this, but I think it can be sumarized as:
- 2006 Z06 does not have magnetic drain plugs (except for maybe late build ones).
- 2007 Z06 has magnetic drain plugs
- 2008 Z06 has magnetic drain plugs until it was deleted from the build sometime in January 08.
Last edited by KGjevre; 09-02-2011 at 07:22 PM.
04-06-2008, 03:40 AM
#4
Racer
Thread Starter
The beginning (from 6/13/07):
http://forums.corvetteforum.com/show...28&postcount=1
http://forums.corvetteforum.com/show...8&postcount=16
The current bulletin AFAIK (from 8/29/07):
http://forums.corvetteforum.com/show...28&postcount=1
SERVICE - CHEVROLET DEALERS
Subject: Rocker Arm Concern Diagnosis on 2007 Z06 Corvette
Models: 2007 Corvette Z06
This message applies to 2007 Z06 models only -- equipped with the LS7 engine.
If your dealership encounters a 2007 model Z06 Corvette with a rocker arm concern, such as needle bearings missing or needle bearings in the oil pan, please contact xxxxx xxxx at xxx-xxx- xxxx before beginning any repairs. We would like to verify certain bolt torques before the bolts are disturbed, using a specific procedure. Thanks in advance for your assistance.
Subject: Rocker Arm Concern Diagnosis on 2007 Z06 Corvette
Models: 2007 Corvette Z06
This message applies to 2007 Z06 models only -- equipped with the LS7 engine.
If your dealership encounters a 2007 model Z06 Corvette with a rocker arm concern, such as needle bearings missing or needle bearings in the oil pan, please contact xxxxx xxxx at xxx-xxx- xxxx before beginning any repairs. We would like to verify certain bolt torques before the bolts are disturbed, using a specific procedure. Thanks in advance for your assistance.
The current bulletin AFAIK (from 8/29/07):
Document ID: 2007847
--------------------------------------------------------------------------------
#PIP4156A: Possible Broken Rocker Arm On LS7 Engine - keywords cam camshaft DTC engine misfire miss noise push pushrod rattle SES tick valve Z06 - (Aug 29, 2007)
Subject: Possible Broken Rocker Arm On LS7 Engine
Models: 2007 Chevrolet Corvette Equipped with the 7.0L LS7 engine
--------------------------------------------------------------------------------
This PI was superseded to update Recommendation/Instructions. Please discard PIP4156.
--------------------------------------------------------------------------------
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
The customer concern may be an upper engine tick noise, or needle bearings found in the oil pan during an oil change.
Recommendation/Instructions:
If a dealer encounters an engine tick noise, or rocker arm needle bearings were found during an oil change, inspect all the rocker arms. If a damaged rocker arm is found, replace only the broken arm. Replacing the whole set of rocker arms is not necessary.
During the repair the technician may be trying to retrieve all of the needle bearings that were lost. Needle bearings may be found in cylinder head oil drains or oil pan. Clean the drains to retrieve the needle bearings, and replace only the damaged rocker arm.
Notie: The diameter of the needle bearing is larger then the oil pump pickup screen mesh. A needle bearing cannot be pulled into the oil pump.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
--------------------------------------------------------------------------------
#PIP4156A: Possible Broken Rocker Arm On LS7 Engine - keywords cam camshaft DTC engine misfire miss noise push pushrod rattle SES tick valve Z06 - (Aug 29, 2007)
Subject: Possible Broken Rocker Arm On LS7 Engine
Models: 2007 Chevrolet Corvette Equipped with the 7.0L LS7 engine
--------------------------------------------------------------------------------
This PI was superseded to update Recommendation/Instructions. Please discard PIP4156.
--------------------------------------------------------------------------------
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
The customer concern may be an upper engine tick noise, or needle bearings found in the oil pan during an oil change.
Recommendation/Instructions:
If a dealer encounters an engine tick noise, or rocker arm needle bearings were found during an oil change, inspect all the rocker arms. If a damaged rocker arm is found, replace only the broken arm. Replacing the whole set of rocker arms is not necessary.
During the repair the technician may be trying to retrieve all of the needle bearings that were lost. Needle bearings may be found in cylinder head oil drains or oil pan. Clean the drains to retrieve the needle bearings, and replace only the damaged rocker arm.
Notie: The diameter of the needle bearing is larger then the oil pump pickup screen mesh. A needle bearing cannot be pulled into the oil pump.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
Last edited by KGjevre; 04-19-2008 at 08:49 PM.
04-06-2008, 03:48 AM
#5
Racer
Thread Starter
What a rocker arm looks like when the end cap is broken and the needle bearings has fallen out:
offset intake rocker arm and exhaust rocker arm:
And what the needle bearings look like (there are 33 per side of the rocker arm):
thanks RichieRichZ06
thanks Beast350
superimposed a scale:
on the magnetic drain plug:
offset intake rocker arm and exhaust rocker arm:
And what the needle bearings look like (there are 33 per side of the rocker arm):
thanks RichieRichZ06
thanks Beast350
superimposed a scale:
on the magnetic drain plug:
Last edited by KGjevre; 07-04-2009 at 04:03 AM.
04-06-2008, 03:59 AM
#6
Racer
Thread Starter
My info:
1. car build month = January 2007
2. how many, and intake or exhaust rocker arm failure = 2, both were the (offset) intake rocker arms
3. stock or modded engine/software = stock
4. mileage when it was discovered = 3797
5. current milage (and no further problem) = car still at dealer wating for a part - will be 3 weeks total on Friday...
6. cylinder # (left/drivers side front to back 1-3-5-7, right side front to back 2-4-6-8) = #7 and #8 (the rear most cylinder on each side)
7. car build date (month/day/year) = 1/30/07
8. engine build date (month/day/year) = 1/22/07 (on line 2 and was the 7th of that day)
BTW, this car has not been abused... I have always been living by the no WOT or over 3500 rpm until oil temp over 150F, and have only done one autox (3 runs) after the break in period and no track time... and the car is completely stock (no tune or other mods)...
1. car build month = January 2007
2. how many, and intake or exhaust rocker arm failure = 2, both were the (offset) intake rocker arms
3. stock or modded engine/software = stock
4. mileage when it was discovered = 3797
5. current milage (and no further problem) = car still at dealer wating for a part - will be 3 weeks total on Friday...
6. cylinder # (left/drivers side front to back 1-3-5-7, right side front to back 2-4-6-8) = #7 and #8 (the rear most cylinder on each side)
7. car build date (month/day/year) = 1/30/07
8. engine build date (month/day/year) = 1/22/07 (on line 2 and was the 7th of that day)
BTW, this car has not been abused... I have always been living by the no WOT or over 3500 rpm until oil temp over 150F, and have only done one autox (3 runs) after the break in period and no track time... and the car is completely stock (no tune or other mods)...
Last edited by KGjevre; 04-16-2008 at 01:39 PM.
04-06-2008, 04:04 AM
#7
Racer
Thread Starter
http://forums.corvetteforum.com/show...3&postcount=52
Very interesting from someone with possibly some inside info (uesd to work at Wixom Build Center)!!!
However, based on my rocker arm failure and build date, that needs to be expanded to include at least the end of January...
However, based on my rocker arm failure and build date, that needs to be expanded to include at least the end of January...
Last edited by KGjevre; 04-06-2008 at 04:42 AM.
04-08-2008, 03:20 PM
#8
Racer
Thread Starter
One more:
http://forums.corvetteforum.com/show...&postcount=176
Profile specifies 2007, list updated.
http://forums.corvetteforum.com/show...&postcount=176
Profile specifies 2007, list updated.
Last edited by KGjevre; 04-08-2008 at 04:44 PM.
04-08-2008, 03:39 PM
#9
Safety Car
If you want to know exactly when your engine was produced look at the 3rd, 4th, and fifth digits of the engine number. That is the day of the year it was produced. For example, my engine number is 321011708. The 3rd, 4th, and 5th digits are 101 so it was produced on the 101st day of the year, or April 11th. Hope this helps...
Grant
Grant
04-08-2008, 04:15 PM
#10
Racer
Thread Starter
If you want to know exactly when your engine was produced look at the 3rd, 4th, and fifth digits of the engine number. That is the day of the year it was produced. For example, my engine number is 321011708. The 3rd, 4th, and 5th digits are 101 so it was produced on the 101st day of the year, or April 11th. Hope this helps...
Grant
Grant
http://forums.corvetteforum.com/show...&postcount=919
I have updated the post above with this info.
Thanks,
Kristoffer
04-08-2008, 08:24 PM
#13
Pro
Member Since: Nov 2006
Location: Coconut Creek Florida
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Thanks for adding me to the list, # 5 Intake is the one that went for me, Car was one of the last 07's to come off the line, it was built in late June of 2007. Had it repaired today and we are going to do another oil change in the next few days to make sure everything has had a chance to cycle out. Will have to keep an eye on it until someone comes out with a fix.
Current mileage 4100
Current mileage 4100
04-08-2008, 08:27 PM
#14
Le Mans Master
Member Since: Oct 2005
Location: Fallston Maryland
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Thanks for adding me to the list, # 5 Intake is the one that went for me, Car was one of the last 07's to come off the line, it was built in late June of 2007. Had it repaired today and we are going to do another oil change in the next few days to make sure everything has had a chance to cycle out. Will have to keep an eye on it until someone comes out with a fix.
Current mileage 4100
Current mileage 4100
04-08-2008, 08:59 PM
#15
"AlohaC5" Senior Member
OEM rocker arm failures, which release needle bearings into the engine, has been a potential "risk area" for the LSx engines - rare, but possible.
I recommend contacting Nate to see if your OEM rockers can be converted by Harland Sharp, which gives your rockers a new trunion, C-clips and new rocker arm bolts.
The cost for the conversion is approx. $250 shipped, which permanently eliminates this issue and provides the reliability you're looking for. They convert LS1/LS6 rockers - I would call and check on the LS7 rockers. Mike
I recommend contacting Nate to see if your OEM rockers can be converted by Harland Sharp, which gives your rockers a new trunion, C-clips and new rocker arm bolts.
The cost for the conversion is approx. $250 shipped, which permanently eliminates this issue and provides the reliability you're looking for. They convert LS1/LS6 rockers - I would call and check on the LS7 rockers. Mike
04-08-2008, 09:41 PM
#16
Racer
Thread Starter
OEM rocker arm failures, which release needle bearings into the engine, has been a potential "risk area" for the LSx engines - rare, but possible.
I recommend contacting Nate to see if your OEM rockers can be converted by Harland Sharp, which gives your rockers a new trunion, C-clips and new rocker arm bolts.
The cost for the conversion is approx. $250 shipped, which permanently eliminates this issue and provides the reliability you're looking for. They convert LS1/LS6 rockers - I would call and check on the LS7 rockers. Mike
I recommend contacting Nate to see if your OEM rockers can be converted by Harland Sharp, which gives your rockers a new trunion, C-clips and new rocker arm bolts.
The cost for the conversion is approx. $250 shipped, which permanently eliminates this issue and provides the reliability you're looking for. They convert LS1/LS6 rockers - I would call and check on the LS7 rockers. Mike
Document ID# 2005633
Subject: Warranty Admin. - Use of Parts and Components (Including Control Module Calibrations) Not Issued Through General Motors #07-00-89-043 - (08/23/2007)
Models: 2008 and Prior GM Passenger Cars and Light/Medium Duty Trucks
General Motors tests and validates the genuine GM parts originally installed on it's vehicles, including the control module calibrations GM issues for use in it's vehicles.
Among the many factors GM considers when validating parts and calibrations for it's vehicles are reliability, durability, safety, emissions, fuel economy, and the effect on other components in the vehicle.
Warranty Coverage
General Motors does not warranty non-GM parts and/or calibrations.
The use of Parts and/or Control Module Calibrations not issued through General Motors will void the warranty coverage for those components that are damaged or otherwise affected by the installation of the non-GM part and/or control module calibration.
The only exception is that non-GM parts labeled "Certified to EPA Standards" are covered by the Federal Emissions Performance Warranty.
Subject: Warranty Admin. - Use of Parts and Components (Including Control Module Calibrations) Not Issued Through General Motors #07-00-89-043 - (08/23/2007)
Models: 2008 and Prior GM Passenger Cars and Light/Medium Duty Trucks
General Motors tests and validates the genuine GM parts originally installed on it's vehicles, including the control module calibrations GM issues for use in it's vehicles.
Among the many factors GM considers when validating parts and calibrations for it's vehicles are reliability, durability, safety, emissions, fuel economy, and the effect on other components in the vehicle.
Warranty Coverage
General Motors does not warranty non-GM parts and/or calibrations.
The use of Parts and/or Control Module Calibrations not issued through General Motors will void the warranty coverage for those components that are damaged or otherwise affected by the installation of the non-GM part and/or control module calibration.
The only exception is that non-GM parts labeled "Certified to EPA Standards" are covered by the Federal Emissions Performance Warranty.
04-08-2008, 09:55 PM
#17
Racer
Thread Starter
Bringing this usefull info over to this thread too, from:
http://forums.corvetteforum.com/show...post1561589144
-kg
http://forums.corvetteforum.com/show...post1561589144
I checked and learned that there are 33 needle bearings on each side of the rocker. Have the tech count how many he finds still up in the clyinder head when he pulls the valve cover and keep tabs on what you find on the drain plug later. If the count goes over 33, go back because another rocker is gone.
I went thru this at 5800 miles (second change, first at 500 miles was OK). I have been occasionally pulling the left drain plug (only lose about 1/2 qt of oil) and checking. Still have not gotten to 33, but still finding pieces of the retainer on the magnet each time. Now have 7000 miles.
I went thru this at 5800 miles (second change, first at 500 miles was OK). I have been occasionally pulling the left drain plug (only lose about 1/2 qt of oil) and checking. Still have not gotten to 33, but still finding pieces of the retainer on the magnet each time. Now have 7000 miles.
Last edited by KGjevre; 04-08-2008 at 09:57 PM.
04-08-2008, 09:55 PM
#18
"AlohaC5" Senior Member
I've never heard of anyone that had their OEM rockers converted by Harland Sharp experience any warranty issues - never - and its a popular conversion on LS1tech.com The rockers maintain their stock appearance, ratio, weight, function, etc. - the HS conversion is internal to the rocker. I had it done to my LS6 rockers - great upgrade! 
I agree - if you were to install a set of aftermarket rockers, then that could potentially void your engine warranty IF you experienced a failure attributable to the aftermarket rockers. However, I don't see GM voiding your Warranty with this rocker conversion by Harland Sharp. Nate has been providing this service for years - call him for details.
I agree - if you were to install a set of aftermarket rockers, then that could potentially void your engine warranty IF you experienced a failure attributable to the aftermarket rockers. However, I don't see GM voiding your Warranty with this rocker conversion by Harland Sharp. Nate has been providing this service for years - call him for details.
Last edited by Gray Ghost GS; 04-08-2008 at 10:23 PM.
04-09-2008, 06:42 AM
#19
Racer
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Henry
04-09-2008, 12:04 PM
#20
I know that this issue was on the LS7 engines that were built from late January to late May of 07. That covers all the R/F cars. I am not saying that they are all bad but if I had one I would check my oil drain plug often. This info only comes from this forum and members that have posted this info. As a GM employee I am not admitting wrong doings here but only relay info as a member of this forum. As a past builder form Wixom we only installed them on the engine we did not make them as some have suggested.
Henry
Henry
This is not good news.
How often? And when you do that, you have to get under the car, and you letting some or maybe even all of the motor oil out. Seems awfully inconvenient.