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MLS head gasket

ade

Well-known member
Joined
Aug 16, 2011
Messages
303
Location
Paumanok NY
im about to pick up a cometic mls hg but need to know what thickness to go with, any help on the subject would help.
heres what they offer

C4233-027 MIT 4G63/T 85.5MM .027" MLS ECLIPS/GALANT,LANCER THRU EVO3
C4233-030 MIT 4G63/T 85.5MM .030" MLS ECLIPS/GALANT,LANCER THRU EVO3
C4233-036 MIT 4G63/T 85.5MM .036" MLS ECLIPS/GALANT,LANCER THRU EVO3
C4233-040 MIT 4G63/T 85.5MM .040" MLS ECLIPS/GALANT,LANCER THRU EVO3
C4233-045 MIT 4G63/T 85.5MM .045" MLS ECLIPS/GALANT,LANCER THRU EVO3
C4233-051 MIT 4G63/T 85.5MM .051" MLS ECLIPS,GALANT,LANCER THRU EVO3
C4233-060 MIT 4G63/T 85.5MM .060" MLS-5 ECLIPS/GALANT,LANCER THRU EVO3
C4233-066 MIT 4G63/T 85.5MM .066" MLS-5 ECLIPS/GALANT,LANCER THRU EVO3
C4233-070 MIT 4G63/T 85.5MM .070" MLS-5 ECLIPS/GALANT,LANCER THRU EVO3
C4233-075 MIT 4G63/T 85.5MM .075" MLS-5 ECLIPS/GALANT,LANCER THRU EVO3
C4233-080 MIT 4G63/T 85.5MM .080" MLS-5 ECLIPS,GALANT,LANCER THRU EVO3
C4233-084 MIT 4G63/T 85.5MM .084" MLS-5 ECLIPS,GALANT,LANCER THRU EVO3
C4233-095 MIT 4G63/T 85.5MM .095" MLS-5 ECLIPS/GALANT,LANCER THRU EVO3
C4233-120 MIT 4G63/T 85.5MM .120" MLS ECLIPS/GALANT,LANCER THRU EVO3

its a stocker, bottom and top end. might see 30psi, might not. lmk wyt.
 

ade

Well-known member
Joined
Aug 16, 2011
Messages
303
Location
Paumanok NY
ill be running meth btw
 

5OF2k

Well-known member
Joined
Mar 28, 2012
Messages
664
Location
colorado springs, colorado
If youre planning to hit 30psi, or really anywhere north of 25-ish, id say a tad on the thicker side to bump the compression down a tad. A thinner HG would effectively raise the compression ratio, and there for the cylinder pressures creating more power, but would be more rough on the rotating assembly. Granted at most youd see a 1/2 to 3/4 increase of a point for the thinner HGs, but it may be enough to make it "iffy".

Just my .02 though. Everyone has different opinions!

-Jake
 

ade

Well-known member
Joined
Aug 16, 2011
Messages
303
Location
Paumanok NY
.051"
 

DynastyLCD

Well-known member
Joined
May 12, 2006
Messages
761
Location
Harwinton, CT
Quoting 5OF2k:
If youre planning to hit 30psi, or really anywhere north of 25-ish, id say a tad on the thicker side to bump the compression down a tad. A thinner HG would effectively raise the compression ratio, and there for the cylinder pressures creating more power, but would be more rough on the rotating assembly. Granted at most youd see a 1/2 to 3/4 increase of a point for the thinner HGs, but it may be enough to make it "iffy".

Just my .02 though. Everyone has different opinions!

-Jake




i agree with Jake on this one. i run a fat 1.6 mm cometic on my stock block setup. probably could have gotten away with a 1.3 because of the low compression, but better safe than sorry. also, like Jake stated, a thinner HG will up the compression a little bit.

then again, 30 psi on what? a 14b or a 35r? turbo selection will create different cylinder pressures due to differences in air flow. so that's something else to consider too.
 

I have run evo gaskets on cars I have built, with no issues.
 
Last edited by a moderator:

EMX5636

Well-known member
Joined
Jun 28, 2008
Messages
1,631
Location
Bucks County, PA
I would run the standard Evo3 MLS gasket over any of the Cometics. I've used a few with ok results, but some have problems. Hard to beat OEM parts. I've run almost 40psi through my Mitsu gasket.
 

codeofdastreets

Well-known member
Joined
Aug 30, 2008
Messages
65
Location
Palm Harbor FL
mitsu mls or feltpro prematorque hg.. Not a fan of cosmetic hg's but if thats what you want to run i'd go with the .51
 

G

Staff member
Joined
Feb 24, 2004
Messages
8,896
Location
zompton
You said stock, but does that mean machined at all?
 

ade

Well-known member
Joined
Aug 16, 2011
Messages
303
Location
Paumanok NY
its no stocker, my mistake. i bought it last November non running with just a turn over and compression numbers. brought it home and started her up. i then pulled the valve cover due to curiosity and found a hot tanked & rebuilt, very clean head.

yes it has been machined. i dunno /ubbthreads/images/graemlins/confused.gif i have no history on the car other than, it's sat since 2001 after a head rebuild for whatever reason. its mine now and i would like to have some safe, sound fun sooooo... i revised the fuel system(this is where it started, stock system was junk), big'er inter-cooler & piping, pte sc34, V3 full, meth kit. at this point the direction i was headed was pretty clear... i was now worried about lifting the head and decided to get arp hardware and a head gasket that can support the above changes.

now since the heads gonna come off, i picked up engnbldr's ss valve(stock spec) guides & revised lifters, also jumped on a set of bc1100's & tit retainers.

right now im thinking, rock the e16g, get used to v3, pick up a long block and put together the inevitable. /ubbthreads/images/graemlins/banghead.gif
 
Last edited:
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