Anyone offer an MLS head gasket for the 4.0?

[JJacobs]

I don't really see any reason to run an MLS on a 4.0. MLS gaskets were designed to cure sealing problems on iron block/ aluminum head engines. Doesn't apply to the 4.0 unless you spent a ton of money.

I've heard said that MLS seal just a bit too well, and a tuning issue (under boost or lots of n20) can take out hard parts instead of just the gasket.

 

[wolfpackjeeper]

MLS = Multi Layer Steel correct?

I am starting to wonder just what you mean by multi layer steel gasket. I have not ever seen a fiber head gasket, at least not on the 4.0's, 5.7's and 5.9's I have torn apart and put back together. I work at a parts store and every head gasket I have sold was a steel one. The in stock 4.0L head gasket at advance auto, made by felpro is a Multi layer steel head gasket.

 

[Boostwerks.com]

I don't really see any reason to run an MLS on a 4.0. MLS gaskets were designed to cure sealing problems on iron block/ aluminum head engines. Doesn't apply to the 4.0 unless you spent a ton of money.

I've heard said that MLS seal just a bit too well, and a tuning issue (under boost or lots of n20) can take out hard parts instead of just the gasket.

Tensile strength. It's a good thing. fiber gaskets have given way from simply high cylinder pressures (no detonation, no pre ignition). Also, the carbon in them can get red hot, and sometimes cause pre ignition.

wolfpackjeeperMLS = Multi Layer Steel correct?

I am starting to wonder just what you mean by multi layer steel gasket. I have not ever seen a fiber head gasket, at least not on the 4.0's, 5.7's and 5.9's I have torn apart and put back together. I work at a parts store and every head gasket I have sold was a steel one. The in stock 4.0L head gasket at advance auto, made by felpro is a Multi layer steel head gasket.

Yup. That would be AWSOME if they already had an MLS gasket on there. The only reason why I'm assuming it has a fiber gasket is because mine (99) has this fiber crap sticking out between the head and block.

I may have to go to the dealer and ask to see the factory gasket on there.

 

[wolfpackjeeper]

there is a coating on either side of the gasket so it looks like a rubber gasket, but it is several layers of steel held together with some sort of binding agent

 

[Boostwerks.com]

there is a coating on either side of the gasket so it looks like a rubber gasket, but it is several layers of steel held together with some sort of binding agent

Are you sure the gasket came with every year? It's not uncommon for them to change around. Thanks for the info though man, I appreciate it. :thumbup:

 

[gradon]

I bought the mopar performance tear-down gasket kit due to it including the mopar performance/victor reinz head-gasket(.043"). They sent me a fel-pro kit with the cork valve and multi-piece oil pan gaskets and the .051" HG(boo across the board). I am planning to send it back and buy the gaskets individually(rubber 1-piece) and the victor-reinz. This is the first time I have read of any issues with the victor-reinz. Is this the reason they are no longer manufactured? Anyone else want to chime in on their experience(or hearsay of others) with it?

 

[wolfpackjeeper]

I was not speaking to the OEM gasket, I was talking about the felpro one you get form the store.

The one I was looking at was a severe duty one, but the normal one is still steel.

My comment on the victor came from an engine builder who refuses to use them

 

[gradon]

What is the compressed thickness of the severe-duty felpro? I wanted the VR cause it's thinner and thought it was a little better quality than the Fel-Pro.

 

[wolfpackjeeper]

not sure, I will have to look at the package and see if it lists one next time I am at work

 

[Boostwerks.com]

Whats the thickness of the factory gasket?

BTW kinda OT, has anyone had the factory head milled to increase CR?

 

[beakie]

my head was decked 12thou when I replaced the gasket.
after looking in stroker threads/boards, that 12thou may have increased CR about .2 over stock, not much really.
but 12thou isn't much, and that was just to get it back to perfect flat after a few overheating issues.

 

[alex22]

Did you talk to Cometic gaskets? One of the guys I work with has used them many times to make custom copper or MLS gaskets. He said their prices were reasonable, not sure if he meant reasonable by cheap jeeper or racer standards. Like I said before, I would go with a copper gasket and ring the block and cut a reciever groove in the head.

~Alex

 

[wolfpackjeeper]

they took .01 off my block when I did my stroker. My boss built my head and cut the valves for me, I dont think he milled it, just checked it for level and cleaned up the mating surface