does anyone know what the stock gm perforance head gaskets LS1 head gasket bore and compressed thickness are? does anyone know what the bore and thicknesses are for the LS1 and 6.0L engines are? i am trying to get some head gaskets that are 11 cc in volume or a little bit bigger? i want to know because i won't use a head gasket if i don't know exactly what the bore and thickness are.

 

Good question, I hope you get a good answer, because I'm interested, too. I searched for 1/2 a day this past week and couldn't find a good, solid answer anywhere. What I did find out is that the GM MLS gaskets come in 2 thicknesses....056 compressed and .060 compressed. Never did find a bore on either one but I'm assuming 4.06. I tried to find the same information on the Graphite GM gasket and couldn't. Surely someone will chime in here and enlighten us!!

 

6.0 MLS is 4.060 bore and .048>.050 compressed

 

I hope you're right!! I just ordered some from SDPC (p/n 12498543) the other day and all he could tell me was that they were 6 Liter and .056 compressed thickness. He couldn't tell me the bore size.

 

I measured mine on my recent install and Bryan at LME verified that the ones he has used on his builds are .048>.050
That is why he set's up the pistons .010 out of hole for .038>.040 quench for street.

 

I know GM started using COMETIC MLS head gaskets on the 2002 LS1/LS6 engines. What is the advantages of using them and what does MLS stand for?

 

Multiple Layer Steel gaskets. Stronger to protect against blown issues, and reusable.

 

This may help some http://www.cometic.com/#

This also http://www.thunderracing.com/catalog...vid=3&pcid=157

 

I had also heard that the 6.0L gaskets were .054, while the 5.7 MLS gaskets were .060.

 

i have a brilliant idea. listen when i was working with my dad to build engines, i had to calulate what the compression ratios of all the engines were. so to make life simple i made a compression ratio program on both my TI-83+ calulator and in a C++ language. it did exactly what the other compression ratio calulators did on the web. i ran into a problem when i started working on BBC namely the pistons. i redid both of my programs so that if you have a desired compression ratio and you don't know one of the parameters of the compression, all you do is type in what you know and the program tells you the exact missing parameter.

ex:
i want this to be my compression ratio for a 350 but i don't know what head size to use

desired comp ratio: 11 to 1
number of cylinders: 8
bore: 4
deck height: 9.025
piston volume: 4.5 cc
piston comp height: 1.56
rod length: 5.7
stroke: 3.48
head volume: ?
gasket bore 4.166
gasket compressed thickness: .041

the head needed to make this desired compression ratio is 61.8 cc

now this will work on not only missing head volume but on any missing parameter as long as the other parameters are known. in the case of head gaskets both can be unknown but all you will get is volume if both are missing.

ok for our problem. i can get the bore sizes of both the LS1 and 6.0L engines head gaskets if you guys can tell me with 100% assureness of what the head sizes of both the LS1 and 6.0 L and what each compression ratio are. i did this to the LM7 piston when i first found out that the pistons were dished. once i knew what the gasket measurement were (measured by the machine shop guy of mine), i ran what i know in the program and it told me it was about 8 cc if my memory is correct. so just tell me what i need to know and i can get the answer in a matter of seconds.