so you used the copper spray on the GM MLS gaskets? how much did you put?

 

so i could spray it on the gm's correct?

 

who came up with the idea of spraying this stuff? Cometic doesn't advise this, who is suggesting the spray?

 

Just put a light coat. I usaully go over the MLS gasket in one pass and make touchups as I see fit. Coat both sides of the gasket just dont over do it and cover up the coolant holes.

 

Alot of us forced induction guys do it. To help hold down the gasket sealing surface. Due to the fact that a boosted or a sprayed car has high cylinder pressure and not enuff head bolts per cylinder to hold it down. Usaully timing can help out with this but some of us are agressive with our tunes.

 

What about hosing down some felpros or is GM's MLS the preferred choice?

 

Do you let the spray dry or spray it on and wait a min before laying it on the head, (this is for the GM MLS head gaskets not the cometics)

 

I wouldn't spray the GM's, they seal very well as long as the surfaces are clean. Not needed.

 

Spray them. It is added insurance from leaks. I put 2 coats on MLS and no leaks on a 200 shot.

 

So what is the census then? My cometics, sprayed with the f'in copper spray are leaking, cometics suck ***, or else I REALLY hope that I don't find the gaskets eating into my heads like a past poster mentioned. I'm replacing with GM MLS LS7 gaskets (LS7 setup here).

Is the copper REALLY adding to the GM MLS gaskets sealing ability? If so, how much should be put?

 

No it is not, the GM gasket has a rubber seal around all the coolant passages. There is no reason to do that.

 

Thats what I figured, I don't know why these other guys are using it on the GM gaskets. I believe it would even slightly disrupt the gasket sealing surface from mating with the heads and block.

 

If they leaked its because your deck surfaces are messed up, you improperly torqued down the bolts, or you had the wrong gasket.

 

They are using it for the same reason everyone else is, it ensures a seal in spots that may be imperfect. It wont disrupt the sealing surfaces at all. Just 2 light coats is all you needed.

 

Cometics installed dry ... no leaks ... no problems...all you need is clean flat deck and head surface ...

 

LOL, no, my deck surfaces are not messed up, I did not improperly torque down the ARP Head Studs, and they were NOT the wrong gaskets.

The motor was built by the late Dave DiLuca, and he has done stellar work, there were no problems there. The GASKETS are the issue.

Many people have had no problems with the cometics, but many people also have had problems with the cometics. I'm one of them.

 

Ok, gaskets just dont leak for no reason. Did Mr DiLuca prep the deck and install the gaskets himself?

BTW its easy to mistakenly order the wrong cometic gasket with the LS heads, there is a slight difference in one of the casting numbers I believe, I think it has to do with a coolant passage. I remember hearing about this before but i cant recall the details. What heads do you have?

The chances of operator error are far more likely than a gasket defect.

 

"The motor was built by the late Dave DiLuca..." So yes, he built the complete long-block, no operator error there. I did not mistakenly order the wrong gaskets either, i talked to several vendors before getting the gaskets, and Dave double checked to make sure they were the right ones as well before installing. Coolant passages are correct. I'm running LS7 heads.

I've already ruled out chances of operator error as being far less likely in my case. But, I'll see fully once I get the heads off though.

 

So is it safe to say that if a block has had a couple sets of heads on and off, it would be justified to use copper spray as there may be slight deck imperfections?

 

I am going to spray my gm mls gaskets, just 2 light coats for the added ins.