My Cometic Head Gaskets still good(pics)
12-13-2006, 08:36 PM
#1
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My Cometic Head Gaskets still good(pics) I've always read that they are reusable but some of the blakc coating is wearing off and Im in the process of putting the motor back together, are these still good or do I need to get another set?
Thanks
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12-13-2006, 10:21 PM
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Originally Posted by allngn_c5
Hope so if you are re-using them. My first set of Cometics DID NOT seal. Good luck.
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12-14-2006, 12:23 AM
#8
Originally Posted by cantdrv65
As much trouble as people have had sealing new cometics I wouldnt use em at all...but thats my opinion.
12-14-2006, 12:24 AM
#9
Originally Posted by Richard@WCCH
If the engine has been heat cycled even once, you'll need to replace them. They won't hold a proper combustion seal anymore. Sorry bout that........... 
Richard
Richard
12-14-2006, 12:29 AM
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Originally Posted by ArcticZ28
I've had two sets and have never had a problem sealing them. I'm confused as to who all of these people are and why they are having sealing problems. I think what some people's problem is is that they don't get the deck surface clean enough. Even the smallest imperfection could cause issues with these gaskets. Even when the gaskets are new, I spray a light coating of copper gasket on them. I've never had a problem.
Ben T.
12-14-2006, 06:21 AM
#11
Originally Posted by ArcticZ28
A lot of people reuse Cometics. That is one of their selling points. I'm not sure why you're saying they can't be reused
12-14-2006, 06:32 AM
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Do those gaskets have some of the black stuff coming off? Im going to pick up some copper spray and clean the hell out of the deck and heads. Thanks for the advice Im going to call Cometic today and see what they say.
12-14-2006, 07:10 AM
#13
Originally Posted by 1slow01Z71
Do those gaskets have some of the black stuff coming off? Im going to pick up some copper spray and clean the hell out of the deck and heads. Thanks for the advice Im going to call Cometic today and see what they say.
12-14-2006, 07:37 AM
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The only gaskets that are reusable to my knowledge is a solid copper with o-ringed block or heads. All other gaskets seal by compressing the sealing bead around the bore. Once the seal is compressed it doesn't bounce back. Kind of the same concept as TTY head bolts. I have reused even regular head gaskets (felpro etc) before with copper coat but not on any high hp applications and certainly not a FI + Nitrous engine. If you reuse them they might seal and work fine? If it was mine I would not reuse them.
12-14-2006, 09:32 PM
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im buying cometics and i asked tony mamo about them leaking and he said, it shouldnt be a problem if the deck is cleaned and smoothed out. I know on the cometic website, it has to meet a certain smoothness factor or something like that.
12-15-2006, 05:40 AM
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I think the reason that the stock gaskets are more trouble free is because they have a coating on them around the sealing areas. Spraying copper coat on the cometics would seem to give the same effect of the sealing surface on the stock gaskets.
12-15-2006, 08:34 AM
#19
I have reused them 3 times on a set and NEVER had a issue.
the 2nd time I reuse them I just clean the up and put them back on then the 3rd time is when I copper coat them. After I copper coat them I wont reuse them.
I'm sprayin a good sized shot on the car also and have yet to have a head gasket leak.
the 2nd time I reuse them I just clean the up and put them back on then the 3rd time is when I copper coat them. After I copper coat them I wont reuse them.
I'm sprayin a good sized shot on the car also and have yet to have a head gasket leak.
01-05-2007, 12:15 PM
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Originally Posted by Richard@WCCH
If the engine has been heat cycled even once, you'll need to replace them. They won't hold a proper combustion seal anymore. Sorry bout that...........
Richard
Richard
i read you can reuse them up to 5 times but after 4 times, i figured it was enough and bought another set of cometics. i never used copper spray. if you do use copper spray do you spray both sides of the gaskits, then the block?? or just the gaskits?