curious to see how many people are using cometics with/or without a leaking issue.Not sure if i want to try them??Any one who has experience with these good or bad please chime in.I want them to run a .045 thick gasket,i dont know if anyone else makes one at .045" thanks

 

We had one motor that leaked BUT we think it was not related to the HG. No one could confirm if it was the cylinder head or gasket.
Phil

 

Most that have problems seem to be using ARP head studs. As long as you ensure your surface prep is good and you Tq to specs you wont have any problems.
Cometic is a very respected name in the gasket world. The lsx crowd has been using, and re-using, thier gaskets for years without issues. They are not the only ones who make a .045 as I believe Fel-pro makes one too.

 

my engine has only 15k miles on it and the heads are freshly milled .018.I think the speed on the mill was a little high,as they have a dull appearence to them,very flat and true though.

 

Im useing cometic .30 thickness with copper coat. No problems with any leaks as of right now.

 

Coated mine with copper spray sealant on the first use, used ARP head studs as well, no leaks.

 

Using Cometics to. First set was .040 and now using .027. No leaks at all, and not using any copper coating. I am using ARP studs as well..

Dan

 

Cometics - .040 - no leaks

 

No leaks here.

 

i installed some on lsevenl's car dry with new stock head bolts, no problems

 

Comectic .040 dry, ARP studs, no leaks

 

Didn't have any leaks, when the motor was still together

 

Never had a leak when the sleeves stayed where they were suppose to!!!!!

 

Comectic .040 copper spray, ARP studs, no leaks

 

.045 & stock headbolts. No leaks.

 

on a friends car, ARP bolts & the Cometics leaked, Changed to Fel pro's, no problems.

 

On my H2 install with AFR heads and ARP studs they seeped for a couple hundred miles. Then they sealed. No fluid loss for the last 500 or so miles.

I was sweating bullets every time I opened the hood thinking I was going to have to pull them.

It helped out to drop a tab of that GM sealant in the overflow tank.

 

.040 gaskets, copper spray and ARP head bolts. No leaks after 800 miles. Like someone mentioned above deck surface prep is the key to ensure a leak-free seal; especially on a used block. Basically both surfaces should be as smooth as possible. I also use Lacquer Thinner to wipe down the surfaces.

 

why did you guys use the copper spray and how much did you use???trying to figure out if i should or not.

 

Cometic .045, light copper sealant spray, standard bolts, no leak (on previous setup, reused it twice with no further sealant spray)