Beware of new GM multilayer head gaskets!!!
Launching!
Joined: Dec 2001
Posts: 263
Likes: 0
From: Jacksonville, FL
Re: Beware of new GM multilayer head gaskets!!! So if we have that notch, we cant use the newer gaskets? But if not, we can use them?
Looks like I have the notch:
http://www.jaxracing.com/lswon/teardown/Mar23_06.JPG
<small>[ April 09, 2002, 08:15 AM: Message edited by: Jax White TA ]</small>
Looks like I have the notch:
http://www.jaxracing.com/lswon/teardown/Mar23_06.JPG
<small>[ April 09, 2002, 08:15 AM: Message edited by: Jax White TA ]</small>
TECH Regular
Joined: Feb 2002
Posts: 414
Likes: 0
From: the moon
Re: Beware of new GM multilayer head gaskets!!! My crank snout looks just like yours from it spinning with the Vortech at 10psi, 2 grooves in it. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
I cut it for a keyway and it's fully keyed now to the ATI damper. I even firmly soldered the key into the crank to make it as rigid as possible.
My heads have that notch also.I almost went with the MLS gaskets But I found some graphites locally in stock. Never had a problem with a head gasket after tons of Nitrous use and later 10psi boost. Managed to break a piston before hurting a gasket.
IMO the graphite gaskets are pretty stout and seal very well.
I cut it for a keyway and it's fully keyed now to the ATI damper. I even firmly soldered the key into the crank to make it as rigid as possible.
My heads have that notch also.I almost went with the MLS gaskets But I found some graphites locally in stock. Never had a problem with a head gasket after tons of Nitrous use and later 10psi boost. Managed to break a piston before hurting a gasket.
IMO the graphite gaskets are pretty stout and seal very well.
TECH Resident
iTrader: (3)
Joined: Nov 2001
Posts: 979
Likes: 0
From: Richmond, VA Where fast cars, well......are hard to come by.
Re: Beware of new GM multilayer head gaskets!!! PSJ: It's under cylinders 3 and 4. If you look at jax's pic and 'imagine' picking the right side up and bringing it to the left, flipping the head 180*, you'll see exactly where.
TECH Resident
iTrader: (3)
Joined: Nov 2001
Posts: 979
Likes: 0
From: Richmond, VA Where fast cars, well......are hard to come by.
Re: Beware of new GM multilayer head gaskets!!! Oh my bad, I see it's not 3&4 now, but wouldn't it be either 3&6 or 4&5, since it's 2nd from the front on one side and 2nd from the back on the other? And the driver's side is odd cylinders while the passenger side is even? Or are they designated 1-4 on one side and 5-8 on the other?
<small>[ April 09, 2002, 10:32 PM: Message edited by: AzzHauler ]</small>
<small>[ April 09, 2002, 10:32 PM: Message edited by: AzzHauler ]</small>
Re: Beware of new GM multilayer head gaskets!!! I had a recurring problem with blowing the driver's side head gasket last year with my old Westech 346ci motor... Just curious.
Teching In
Joined: Feb 2002
Posts: 37
Likes: 0
From: Mesquite, TX
Re: Beware of new GM multilayer head gaskets!!! 1,3,5,7 on Drivers side, one being front of car. 2,4,6,8 on Passenger side, 8 at firewall. I have a 99 TA and used the 02 gaskets with no problems.
Re: Beware of new GM multilayer head gaskets!!! The notch is under the #4 cylinder on passenger side and under the #7 cylinder on drivers side.
I have 4 sets of heads. All 4 sets have notches. Three sets are from 99's. one is from a 2000.
I had parts check the part #'s. They show the same head from 99-02. But the new gasket for only 02. He called GM engineering. They said they have not changed the heads since 99. We had a new head in stock for a 99-02. We opened it. It did not have the notch. So I guess sometime in 2000 is when they changed it. So I guess if you don't have hte notch you can use the gaskets. I'm going to have the notch filled by a machine shop and use the new head gaskets.
I have 4 sets of heads. All 4 sets have notches. Three sets are from 99's. one is from a 2000.
I had parts check the part #'s. They show the same head from 99-02. But the new gasket for only 02. He called GM engineering. They said they have not changed the heads since 99. We had a new head in stock for a 99-02. We opened it. It did not have the notch. So I guess sometime in 2000 is when they changed it. So I guess if you don't have hte notch you can use the gaskets. I'm going to have the notch filled by a machine shop and use the new head gaskets.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Launching!
Joined: Dec 2001
Posts: 263
Likes: 0
From: Jacksonville, FL
Re: Beware of new GM multilayer head gaskets!!! I have stuck an arrow on my head pic pointing to the notches. The bottom head came off the passenger side.
<img src="http://www.jaxracing.com/lswon/notch.jpg" alt="" />
<img src="http://www.jaxracing.com/lswon/notch.jpg" alt="" />
Re: Beware of new GM multilayer head gaskets!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Speed Demon:
<strong>Do the 6.0L heads have this notch?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">mine don't <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong>Do the 6.0L heads have this notch?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">mine don't <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
TECH Apprentice
Joined: Dec 2001
Posts: 322
Likes: 1
From: Webster, Tx, USA
Re: Beware of new GM multilayer head gaskets!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 30thta436:
<strong>
Installed hardened rod bearings.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Where do you get hardend rod bearings from? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong>
Installed hardened rod bearings.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Where do you get hardend rod bearings from? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: Beware of new GM multilayer head gaskets!!! On my 02 the heads that came off did not have that notch and the new heads that went on it also did not have the notch. Here's a picture of both.
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day3/MVC-135S.JPG" alt=" - " />
Wierd....
<img src="http://www.sigma-epsilon.org/steve/images/performance/headcam/day3/MVC-135S.JPG" alt=" - " />
Wierd....
Re: Beware of new GM multilayer head gaskets!!! I have looked at a lot of heads. I have determined that the notch is present on 98 to mid year 2000. 2000 to 2002 don't have the notch. every 98-99 head I have looked at has had the notches. Every 01-02 head has not had the notches. I have seen 2000's with and without notches. So I believe sometime in 2000 model year they eliminated the notches. GM denies the existance of the notches(even when faxed a picture of it). Hope that answers some of the questions.
