Lucky #7
Thread Starter
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
Lucky #7
I'm in the process of installing a 2001+ intake and decided to not take any chances with old cylinder #7. The crossover pipe for the front fits perfect in the rear.
Last edited by lucky131969; Jun 23, 2010 at 03:42 PM.
Safety Car
Joined: Dec 2004
Posts: 3,526
Likes: 20
From: Santa Fe TX
Like you, I didn't want to take any chances, but I also didn't want to spend $60 on two crossover tubes, so I ground the ribs on the intake -- Perfect fit. I just used the pictures on here and didn't even test fit it first. Fell right on the existing 1997 coolant lines
Thread Starter
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
Like you, I didn't want to take any chances, but I also didn't want to spend $60 on two crossover tubes, so I ground the ribs on the intake -- Perfect fit. I just used the pictures on here and didn't even test fit it first. Fell right on the existing 1997 coolant lines
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I am wondering, once the air is purged, what is the use of the rear cross-over? I wouldn't think enough flow would go through to aid in cooling and if the pump is putting out "X" gpm and you are flow limited at high RPM, and then you divert some flow from the head to the cross-over are you effectively reducing the cooling capability? I am just thinking out loud and wondering what is the better setup?
When I re-fill, I always lift the front of the car, it really helps with air removal.
When I re-fill, I always lift the front of the car, it really helps with air removal.
Team Owner
Joined: May 2007
Posts: 48,589
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From: In the woods so F%^$ O&&
St. Jude Donor '17-'18-'19
O.k. this doesn't make much sense to me. The #7 problem happens on the LS1's and they already a cross over tube with a back to front connect. This is not an LS6 problem.
Thread Starter
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
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Team Owner
Joined: Mar 1999
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From: At the beach in little Rhody
Corvette-Chris, I just saw you lost the motor, sorry to hear that. Didn't you just finish a head/cam installation? What happened?
Le Mans Master
Joined: Jul 2005
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From: Shreveport/Bossier Louisiana
St. Jude Donor '08
I am trying to figure out what it is buying you (I will have mine apart shortly as well) and if someone has definite data that indicates it helps the rear cylinders then I have no problem spending the money. Perhaps Evil-Twin might have input on this subject.
Corvette-Chris, I just saw you lost the motor, sorry to hear that. Didn't you just finish a head/cam installation? What happened?
Corvette-Chris, I just saw you lost the motor, sorry to hear that. Didn't you just finish a head/cam installation? What happened?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Yeah, only a couple months ago I finished it. I think the initial tune had alot to do with it and the more I read about my problems from some pretty serious HP junkie here, thats what they suspect also. I think just not enough tuning time the first time I was there and it was going lean up top. It started running worse and worse so I took it back but by that time it was too late. If you would like to know more just shoot me a PM
Le Mans Master
Joined: Jul 2005
Posts: 7,121
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From: Shreveport/Bossier Louisiana
St. Jude Donor '08
I may need to drive a while to find someone like him because I dont want to take any chances on the new motor
Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
There doesn't appear to be a clear answer from everything I have read. Some say tuning and some say cooling. I am taking no chances, I am installed a DeWitts with my new heads and my tuner is very careful to ensure the car isn't lean on the street. Both may be key. Note also that GM tends to run the car rich, which is safer. Also, my tuner showed me just how much difference taking the car from 12.5:1 to 13:1 on the dyno made, I think it was 2 or 3 hp so in my mind its not worth the risk to run the car too lean.
Team Owner
Joined: Mar 1999
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From: At the beach in little Rhody
Most who have a problem usually from what I have seen fracture the piston to the top ring land. There are a couple of theories, one is the tune is too lean and the other is that the rear cylinders are not cooled as well and suffer the most.
Safety Car
Joined: Jun 2003
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From: Coconut Creek FL
I'm in the process of installing an LS6 intake and decided to not take any chances with old cylinder #7. The LS6 crossover pipe for the front fits perfect in the rear.
http://www.flickr.com/photos/1545929...85312/sizes/l/
http://www.flickr.com/photos/1545929...85312/sizes/l/
can you tell us (maybe a dumb question) where you routed the line to and how did it connect at the front?I like it!
