1G COMETIC HG WITHOUT MACHINING

[YungTlon]

So my motor was rebuilt right before i bought the car and is somewhere around 60k miles. I have a cometic headgasket and i am going to make sure everything is straight, I know the chances of this not sealing are high but i have heard some people get away with it, anyone who has got away with it please comment on this thread with personal experiance

And im sorry if it isnt clear but I'll be running it without MACHINING the head or decking the block

 

[Mello]

I would suggest considering using a composite head gasket if you are not going to machine the head or block surfaces. Either OEM or Felpro work well. You still need to be checked for flatness & don't screw them up or gouge/scratch when cleaning & removing the old gasket material. Aluminum heads are soft.

 

[SasaniFab]

If the engine has a mls type gasket on it already you’ll probably be ok, if it has a composite gasket.... don’t waste your time.

 

[Lilslmj]

I've ran a cosmetic without machinine. It worked, but always seeped coolant and oil. Combustion was fine and sealed fine. I ended up pulling the head and went with a felpro. I had no problems with the felpro and AARP's running 30-35 psi.

 

[1990TSIAWDTALON]

I would run Felpro or stock composite if I didn't do machine work.

 

[kenuwine4g63]

I would suggest considering using a composite head gasket if you are not going to machine the head or block surfaces. Either OEM or Felpro work well. You still need to be checked for flatness & don't screw them up or gouge/scratch when cleaning & removing the old gasket material. Aluminum heads are soft.

Im going to agree with this. If you havnt decked and shaved the block then do not run that gasket. Especially if your running a good bit of boost.

 

[YungTlon]

If the engine has a mls type gasket on it already you’ll probably be ok, if it has a composite gasket.... don’t waste your time.

Yes it already had the mls!
And everyone else commenting , thanks for the 0.02 i was just trying to get a idea!

 

[DSM_Ant]

Yes it already had the mls!
And everyone else commenting , thanks for the 0.02 i was just trying to get a idea!

If your set on the mls i say hit it with Copper spray for extra security!

 

[motomattx]

If your set on the mls i say hit it with Copper spray for extra security!

No way to copper spray on a mls gasket or any head gasket for that matter, the last thing you want to do is glue down a gasket when its job is to be able to actually move, that would defeat the purpose of the gasket, this is the same reason that our stock gaskets are coated with graphite, so they can move when the aluminum head and steel block expand and contract at different rates.

 

[donniekak]

If your set on the mls i say hit it with Copper spray for extra security!

Copper spray is best for re-using gaskets without a viton layer. Gaskets that come with a thin rubber coating work best on clean dry surfaces. If you spray them the solvent in the spray damages the coating.

 

[Diamond Star Werks]

No way to copper spray on a mls gasket or any head gasket for that matter, the last thing you want to do is glue down a gasket when its job is to be able to actually move, that would defeat the purpose of the gasket, this is the same reason that our stock gaskets are coated with graphite, so they can move when the aluminum head and steel block expand and contract at different rates.

Copper spray doesn't glue anything down. It never hardens.

It's best to not even use cometic. Felpro or OEM. Don't try to get away with a MLS without proper machine work. Doing something you know your not supposed to do and doing it anyway is called stupid. If it seeps coolant and oil that means it didn't work.

 

[YungTlon]

UPDATE*
19psi tuned by my dad on a 61mm turbo
Headgasket sealed!