Dave88z

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.

BAD2000TA

iTrader: (6)

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!

Russ K

iTrader: (1)

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

forcd ind

iTrader: (7)

i just meas some factory (6.0) gaskets this morn, off my engine, they were about .053 at the sealing ridge

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.

405HP_Z06

iTrader: (11)

6.0L head gasket bore diameter is 4.039"

jmm98LS1

iTrader: (28)

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!

forcd ind

iTrader: (7)

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

405HP_Z06

iTrader: (11)

What is the part number of the gasket you measured?

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...

STAR

iTrader: (1)

AFR recommends to use a gasket with a minimum of 4.125 bore.

MOSTDELUXE

iTrader: (3)

AFR 225cc heads need a gasket bore size of at least 4.135. I used felpro #1162 nice gaskets but $170 for a pair.

MOSTDELUXE

iTrader: (3)

BTW the felpros are .054 thick

405HP_Z06

iTrader: (11)

Here you go, all of the specs on all of the head gaskets I know of:

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.

TJ

iTrader: (10)

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.

405HP_Z06

iTrader: (11)

Yep, along with the following:

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

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

405HP_Z06

iTrader: (11)

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.