1g or 2g head gasket?

Talon69 · #1 02-25-2006, 11:15 AM

putting the 1g head on my 7 bolt block. Iknow the head studs are smaller on the 7 bolt and bigger on the 6 bolt, but what im asking is do i buy the head gasket for the 7 bolt or go with the 1g gasket that has bigger holes? 2g head gasket i think is the one to go with correct?

scottsee · #2 02-25-2006, 11:45 AM

1g MLS Head Gasket, No copper spray, and 11mm ARP head studs!

Talon69 · #3 02-25-2006, 08:30 PM

Quote:

Originally Posted by scottsee

1g MLS Head Gasket, No copper spray, and 11mm ARP head studs!

The mls head gaskets i was looking at are only .059 thick, stock HG i measured from my head was .050, so not to much of a differents. What about the 4 layer metal gasket? why not use that, its .040 thicker than stock.

scottsee · #4 02-25-2006, 09:27 PM

Metal head gaskets require a special finish on the cylinder head.. It needs to be milled to an RA-30 type finish. Supper smooth.

http://www.wheelspin.net/calc/calc2.html

Talon69 · #5 02-25-2006, 11:09 PM

ok cool thanx, what about the copper head gaskets? so the 4 layer metal head gasket from mitsubishi is out of the question i guess. Its just that the mls is not much thicker than stock.

scottsee · #6 02-25-2006, 11:20 PM

You can use the Mits OEM, just not a Cometic, HKS, exc. Copper spray is a gasket adheaver, it wont let the head gasket flex if it needs to..

kjewer1 · #7 02-26-2006, 05:10 AM

For what it's worth, 1g and 2g HGs are identical. EVO8s are slightly different and are not interchangeable. Also interesting (I thought) the EVO comes with an MLS gasket stock. Sweet.

scottsee · #8 02-26-2006, 10:20 AM

I always thought the coolant & oil passages were a little larger on the 1g gaskets..?..

Talon69 · #9 02-26-2006, 10:46 AM

These were the copper head gakets i was talking about.

http://www.slowboyracing.com/more.ph...1&mods=14-3041

and what about this head gasket?

http://www.dsmparts.com/customer/pro...cat=119&page=1

Sorry to be a pain but i just wanna make sure i get the right HG the 1st time and the thickest one i can find that will work for me

scottsee · #10 02-26-2006, 10:59 AM

I've always been under the impression that a metal head gasket needs a supper fine surface to adheave to. You're best to call SBR and ask them about the 4 layer MLS & copper gasket. I know my Cometic needs the RA surface job done to the head before it goes on!

SLoe · #11 02-26-2006, 12:34 PM

Quote:

Originally Posted by scottsee

I've always been under the impression that a metal head gasket needs a supper fine surface to adheave to. You're best to call SBR and ask them about the 4 layer MLS & copper gasket. I know my Cometic needs the RA surface job done to the head before it goes on!

Not if you are using stainless wire around the cylinder. No special finish on the race cars that come through the shop. Just rtv around the water pasages. If you aren't using o-rings, you probably would have to have a near perfect mating surface, but I don't see any reason to use a copper gasket without o-rings.

defiancy · #12 02-26-2006, 12:58 PM

The one I'm using for my car is the mitsu evo3 mls head gasket.

kjewer1 · #13 02-26-2006, 11:32 PM

The mitsu MLS gasket doesn't need any special prep work, just the usual (very clean surfaces, I go over them with a razor blade for a good 20 minutes to make sure all of the old composite gasket is removed. another advatange to metal gaskets, cleanup is easier the next time around

). The Cometic and similar do need very smooth surfaces, at least with no orings. Too many poeple have learned this the hard way. Cometic recomends a finish RA of around 30 if I remmeber correctly. A good machinist will ask what type of gasket you plan to use before doing the resurface, mine always does.

92GSXguy · #14 10-09-2014, 08:45 AM

So I just got my cylinder head sent out to a machine shop for my 1g eclipse. They told me they machined .008 off of the head cuz it was warped and hot tanked it and gave it a valve job, when I put it back in the car it started but the oil turned a chocolate milk color. I have a STM head gasket on it but I'm pretty sure it's dumping antifreeze into the oil. As it's started you can hear the coolant gargling down in. I'm stuck on what to do, some people say to junk my head because there's too much machined off, any suggestions?

toddrs93 · #15 10-09-2014, 11:54 AM

Quote:

Originally Posted by 92GSXguy

So I just got my cylinder head sent out to a machine shop for my 1g eclipse. They told me they machined .008 off of the head cuz it was warped and hot tanked it and gave it a valve job, when I put it back in the car it started but the oil turned a chocolate milk color. I have a STM head gasket on it but I'm pretty sure it's dumping antifreeze into the oil. As it's started you can hear the coolant gargling down in. I'm stuck on what to do, some people say to junk my head because there's too much machined off, any suggestions?

no offense but are you positive you did the install correctly? Didn't miss anything like get a piece of dirt or something sandwiched in between or improperly torqued the head? too much machined off is going to cause valves to hit pistons, I doubt theres an issue there

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