Cometic Head Gasket Preperation

[cpac]

I Am About To Install A Set Of .040 Cometics ,would You Guys Copper Spray Or Put Them On As They Come ,head And Block Are Surfaced For Cometics..i Am Useing Studs

 

[TURBO 6]

I used the copper spray and never had a problem. I wouldn't put them on dry.

 

[sweetv6]

I Am About To Install A Set Of .040 Cometics ,would You Guys Copper Spray Or Put Them On As They Come ,head And Block Are Surfaced For Cometics..i Am Useing Studs

use copper spray between ech layer pop one rivet only

Claude

 

[Turbo1dr]

Don't forget to put some Cadilliac pills in the cooling system too.

 

[cpac]

thanks guys

 

[gnxtc2]

use copper spray between ech layer pop one rivet only

Claude

I just installed a set this past Friday.

I took the layers apart and sprayed copper coat on each layer. I took out all the rivets. When Cometic put the gaskets together, they did not line up with each other. Just got to remember to layer 'em back in order

Also check that all the cooling holes are there.

Also, when I took them apart, there was dirt in the layers from the factory.

Billy T.
gnxtc2@aol.com

 

[vacuum 6]

Don't forget to put some Cadilliac pills in the cooling system too.

Agree. After install you may get some head weeping. Also of guys have the issue and a lot dont. I did and fix with the GM pills.

 

[cpac]

Gnx .did You Also Copper Coat The Viton Surface ,cometic Suggests No Coatings Superrrrr Short Block Nice

 

[cpac]

Dirt Between Layers, No Wonder Cometics Weep Coolent

 

[gnxtc2]

Gnx .did You Also Copper Coat The Viton Surface ,cometic Suggests No Coatings

Yep. Took apart all layers and spray 'em all with copper, even the viton coated sides. Everyone that I spoke with said to take them apart and coat them. I had to drill my gaskets because I did the cooling mods to the heads and block.

I don't understand how the viton side is going to seal with such a thin layer of viton.

If anyone seen the Fel-Pro MLS gasket, it has a sticky coating on it. The Fel-Pro instructions say once you open the package, the gasket must be installed. The Fel-Pro gasket has a bead of silicone around the coolant ports.

Superrrrr Short Block Nice

Thanks


Billy T.
gnxtc2@aol.com

 

[gnxtc2]

Dirt Between Layers, No Wonder Cometics Weep Coolent

This was the case with mine. I would seriously check the gaskets before putting them on.

Also, my gaskets were not lined with each other. I'm not a fan of leaving the rivets in. The gasket has a chance of not sitting flat on the block. There are dowel pins on the deck of the block and rivets could fight each other. Once I removed the rivets, the gaskets layed flat.

Billy T.
gnxtc2@aol.com

 

[cpac]

What Modifcations For Cooling....i Have Iron Heads On A 109 Block

 

[sweetv6]

Thanks Billy to sharing that nice experience

good luck in your project it look pretty nice and good

Claude

 

[gnxtc2]

Thanks Billy to sharing that nice experience

good luck in your project i look pretty nice and good

Claude

Thanks

Billy T.
gnxtc2@aol.com

 

[gnxtc2]

What Modifcations For Cooling....i Have Iron Heads On A 109 Block

I don't know if they will work on iron heads with a 109.

Billy T.
gnxtc2@aol.com

 

[TT/Ameasap]

TTT for good tips!

 

[Under Pressure]

TTT for good tips!

I did them with and without the copper spray and didnt have any issues in either case, but i would say use the copper spray for insurance .Great gaskets .

 

[turbojimmy]

TTT for good tips!

Yeah - wish I had seen this a few weeks ago.

Jim

 

[Dr.drivability]

commetics

IMHO, I think were making this a bit difficult guys. With the advice of Champion, I use Permatex Hy-tach on both sides and retorqe once and no leaks! Dave

 

[disco stu]

Some guys get lucky.

Use the copper spray. I had a set weap oil over night after I primed the motor (I had to prime the hell out of it, a couple of lifters were being stubborn). came back the next morning to oil dripping down the side of the block. After just priming it. Perfectly decked surfaces BTW. Cometic swears they wont leak. Talk to the LS1 guys.

But it works like a charm. I put alot of mid nine 26-27 pound passes on mine.

Retorque them onb the stand til they won't take any more torque. Back them off 1/4 turn to do it. When they stop tightening the same amount you loosened them you are good. Let sit for awhile between retorqueing.

I made a thing to hold two heat guns at the water passages to heat the head til the whole thing is about 200 degrees. But I am weird. Beats retorqing in the car after heat cycles.

It's weird, when I worked for BMW I never had a problem. Their gaskets look identical in construction.