LB7: 2001 Head gaskets?

WolfLMM

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Nov 21, 2006
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I have heard of problems? I plan a building this truck into a 600hp stock motor street truck. Basically the same thing I did to my LLY, just in a LB7:D.
 

IOWA LLY

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Feb 23, 2007
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What was changed? I know GM has revised head gaskets a couple of times...
 

WolfLMM

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Team crouton:rofl: thats good. Has anyone made big power with stock bolts and gaskets? I don't want to stud this one.
 

RENODMAX

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Mar 4, 2008
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yes of course but id get some gaskets from guy. hell have the best answer. i think pat uses "c" thickness but i am not sure. he would know whats best. stock bolts will hold ~55 psi no problemo. if you have an lb7 and put new gaskets on it youll bend a rod before you lift a head
 

IOWA LLY

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Feb 23, 2007
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yes of course but id get some gaskets from guy. hell have the best answer. i think pat uses "c" thickness but i am not sure. he would know whats best. stock bolts will hold ~55 psi no problemo. if you have an lb7 and put new gaskets on it youll bend a rod before you lift a head



You determine which gaskets to use based on piston protrusion. Not what someone else runs.;)
 

WolfLMM

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What I'm saying is I'm not tearing into the motor. I guess we will see how long this one last. My LLY is still alive.
 

RENODMAX

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Get ahold of tim at st Joseph diesel.
I'm sorry Iowa I don't know what pat runs I meant for lb7s that's what's holding best on stock motors iirc
 
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IOWA LLY

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Get ahold of tim at st Joseph diesel.
I'm sorry Iowa I don't know what pat runs I meant for lb7s that's what's holding best on stock motors iirc



It makes no difference what motor it is. If you don't check protrusion your asking for trouble. If your simply replacing gaskets on a motor and not doing any other changes then you will be fine going with C grade gaskets. Although if your motor came with A grade gaskets you will be dropping compression a fair amount going to grade C's. It will not cause any major mechanical problems though.

Now if you doing a motor build of any kind you need to check protrusion before selecting which gaskets to use or you may end up with way to much or way to little "piston to head" clearance. The latter could cause major mechanical damage.
 

TrentNell

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Jul 7, 2008
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I have heard of problems? I plan a building this truck into a 600hp stock motor street truck. Basically the same thing I did to my LLY, just in a LB7:D.

i have been ok so far 52-55 psi normally WOT and have hit 60 many times and ran 10 passes or so @ 60-62 psi until i got the gating working right . plus ran for a year with my s300 @ 42 psi like i said so far i have been fine 2001 original head gaskets but i know they will fail some time but i would have figured it wouldnt have taken this much abuse . bottom line be ready for them to fail and if they dont great ! that is what i have done .
 

WolfLMM

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i have been ok so far 52-55 psi normally WOT and have hit 60 many times and ran 10 passes or so @ 60-62 psi until i got the gating working right . plus ran for a year with my s300 @ 42 psi like i said so far i have been fine 2001 original head gaskets but i know they will fail some time but i would have figured it wouldnt have taken this much abuse . bottom line be ready for them to fail and if they dont great ! that is what i have done .

You have exactly what I want. I going to go with twin CP3's though. Thats good to know. Thanks
 

ZeroGravity58

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Mar 23, 2008
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i have made about 50 or 60 passes on mine with the 4094 and 50 or 60 passes with the stock turbo. It has stock bolts and gaskets. I run 40-42 PSI with the 4094. i wouldnt think my motor would last as long as it has. So far so good....
 

RENODMAX

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Mar 4, 2008
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It makes no difference what motor it is. If you don't check protrusion your asking for trouble. If your simply replacing gaskets on a motor and not doing any other changes then you will be fine going with C grade gaskets. Although if your motor came with A grade gaskets you will be dropping compression a fair amount going to grade C's. It will not cause any major mechanical problems though.

Now if you doing a motor build of any kind you need to check protrusion before selecting which gaskets to use or you may end up with way to much or way to little "piston to head" clearance. The latter could cause major mechanical damage.

So what you are saying is Im right...Hes keeping the motor stock. Why bring a built motor into it? Maybe ask questions about why yours no worky instead of post nonsense.
 

IOWA LLY

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Feb 23, 2007
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So what you are saying is Im right...Hes keeping the motor stock. Why bring a built motor into it? Maybe ask questions about why yours no worky instead of post nonsense.



No. That is not what I said. If his motor has A gaskets now, and he installs C gaskets he will be fine as in he will have plenty of clearance and not damage anything. He will however lower his compression a good deal. That may or may not be acceptable to him.

The best thing to do would be re-install the same grade as came out of the motor. Make sure you check both sides.;) If all this sounds like nonsense to you then I suggest you get someone to help you if you ever decide to tear into your motor.;)
 

WolfLMM

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Reno and Iowa, I understand the basics of engine building:cool2:. The whole idea here is not to tear into one.