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Need .054" head gaskets for 408.

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Old Jan 3, 2009 | 11:32 AM
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Default Need .054" head gaskets for 408.

Hey everyone, I am looking for a head gasket that is about .054" thick. Thunder lists cometics on their web site with 4.190 bore, .054 but I think its a misprint. They are not listed on cometics web site. I believe someone found one in a Fel-pro mls but I cant seem to find it. Thanks for the help.
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Old Jan 3, 2009 | 11:52 AM
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Won't factory MLS head gaskets work? The LS1 gasket is that thick. Check to see if the LS3 or LS7 has the bore diameter you need. The thickness should be fine. I wouldn't waste money on the Cometics if I didn't have to. GM head gaskets have worked perfectly for me.

Oh, and I'd stay away from the Felpros! I've read some threads in which they failed. Why risk it!
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Old Jan 3, 2009 | 11:58 AM
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Looking at my Cometic catalog, they list.027,.030,.036,.040,.045,.051,.060, .066,.070,.075,.080,.086,.092,.098,.120 and .140

Russ Kemp
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Old Jan 3, 2009 | 12:59 PM
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i just meas some factory (6.0) gaskets this morn, off my engine, they were about .053 at the sealing ridge
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Old Jan 3, 2009 | 02:36 PM
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Thanks guys, I forgot that the factory gaskets were that thickness. Does anyone know the bore diameter? I think people have used factory LS2 gaskets for 408 motors.
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Old Jan 3, 2009 | 06:25 PM
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Originally Posted by Dave88z
Thanks guys, I forgot that the factory gaskets were that thickness. Does anyone know the bore diameter? I think people have used factory LS2 gaskets for 408 motors.
6.0L head gasket bore diameter is 4.039"
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Old Jan 3, 2009 | 06:26 PM
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Some places list them at 4.02" bore, others say they are 4.039"......they better be 4.039" cuz I got a set coming for my 370 on Monday!
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Old Jan 3, 2009 | 09:00 PM
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i meas the width also when i ck'ed the thickness today, it was almost 4.050
if your not careful, you can really slice your fingers on those things, lol
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Old Jan 3, 2009 | 09:23 PM
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Originally Posted by forcd ind
i meas the width also when i ck'ed the thickness today, it was almost 4.050
if your not careful, you can really slice your fingers on those things, lol
What is the part number of the gasket you measured?
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Old Jan 4, 2009 | 09:17 AM
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Does anyone know the specs for the L92 gasket? I believe it has a bigger bore. Are all GM MLS gaskets the same thickness?
I was searching this and came across a post where someone said AFR heads require a gasket bore of 4.190. I have never heard of this, but I was curious if this applies to my TFS heads.
Someone should make a sticky of all the factory head gasket specs...
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Old Jan 4, 2009 | 10:29 AM
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Originally Posted by Dave88z
Does anyone know the specs for the L92 gasket? I believe it has a bigger bore. Are all GM MLS gaskets the same thickness?
I was searching this and came across a post where someone said AFR heads require a gasket bore of 4.190. I have never heard of this, but I was curious if this applies to my TFS heads.
Someone should make a sticky of all the factory head gasket specs...
AFR recommends to use a gasket with a minimum of 4.125 bore.
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Old Jan 4, 2009 | 10:41 AM
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AFR 225cc heads need a gasket bore size of at least 4.135. I used felpro #1162 nice gaskets but $170 for a pair.
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Old Jan 4, 2009 | 10:42 AM
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BTW the felpros are .054 thick

Last edited by MOSTDELUXE; Jan 4, 2009 at 10:43 AM. Reason: spelling
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Old Jan 4, 2009 | 11:28 AM
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Originally Posted by Dave88z
Does anyone know the specs for the L92 gasket? I believe it has a bigger bore. Are all GM MLS gaskets the same thickness?
I was searching this and came across a post where someone said AFR heads require a gasket bore of 4.190. I have never heard of this, but I was curious if this applies to my TFS heads.
Someone should make a sticky of all the factory head gasket specs...
Here you go, all of the specs on all of the head gaskets I know of:

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Old Jan 4, 2009 | 03:30 PM
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OMG! 405HP you are the man! That chart is PERFECT. I am definitely going to use that info a lot. Did you make that yourself? Great job.
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Old Jan 4, 2009 | 04:19 PM
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Originally Posted by Dave88z
I was searching this and came across a post where someone said AFR heads require a gasket bore of 4.190. I have never heard of this, but I was curious if this applies to my TFS heads.
i have trick flow 235's on a 4.030 bore and would like to know as well.
i was going to run the GM MLS gasket. i need to get on the phone with trick flow.
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Old Jan 4, 2009 | 04:43 PM
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Originally Posted by Dave88z
OMG! 405HP you are the man! That chart is PERFECT. I am definitely going to use that info a lot. Did you make that yourself? Great job.
Yep, along with the following:

https://ls1tech.com/forums/generatio...mpilation.html

https://ls1tech.com/forums/generatio...mpilation.html
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Old Jan 4, 2009 | 04:48 PM
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Originally Posted by TJ
i have trick flow 235's on a 4.030 bore and would like to know as well.
i was going to run the GM MLS gasket. i need to get on the phone with trick flow.
Measure the width of the combustion chamber on the head and the bore diameter of the block. Then, pick a gasket with a bore diameter larger than both measurements and the thickness your looking for.
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