[428ratkiller]

I have a set of Cometic gasket I ran on a motor that had around 80 passes before the block cracked # 4 main saddle. Old motor had cast iron heads new motor will have Edelbrocks.

[estep455]

i reuse mine and have three times before seeing signs of leaking. clean them and use copper coat on them with no problems.

[Rob B]

Dumb question/ dumb move here: I installed a brand new set of Cometics that I coated with copper coat before I installed and torqued them down on my new build when I discovered that the E heads pushrod holes were not clearanced. So when I finally pull the heads back off to fix that issue, what do I need to do to them before reinstalling them? Just coat them again or thoroughly clean the gaskets of the old coating then reinstall. I know the answer but I'm curious what other do when the re-use them. The motor has never been fired yet.

[estep455]

Originally Posted by Rob B

Dumb question/ dumb move here: I installed a brand new set of Cometics that I coated with copper coat before I installed and torqued them down on my new build when I discovered that the E heads pushrod holes were not clearanced. So when I finally pull the heads back off to fix that issue, what do I need to do to them before reinstalling them? Just coat them again or thoroughly clean the gaskets of the old coating then reinstall. I know the answer but I'm curious what other do when the re-use them. The motor has never been fired yet.

i would cleanthem with brake clean recoat them and install. i always retorque after start up

[65nss4spdGTO]

Originally Posted by estep455

i would clean them with brake clean recoat them and install. i always retorque after start up

I will add one more note, keep the gasket with the original head, I also would not re-use the gasket if the head was re-surfaced while the gaskets were off.

Calvin Hill
Hill Performance
708-250-7420

[charlie66]

If you call cometic they will tell you not to coat them. I have coated them too. but I tried not coating them and I still have the same one on a year later and I run a turbo with 25psi.. just passing on what I was told....

[Torment]

Never found any gain coating them - they're coated when they arrive. If reused however I'd coat them as the original coating is pretty sketchy after removal - I've used copper coat and red spray tack with equal success. Brakekleen will remove the original coating as well if that's a goal.

What's key is a smooth/mirror finish on the heads and block - no cutter marks.

[RA462]

I was told to clean them off and spray them with SILVER spray paint. It worked just fine for me.

[428ratkiller]

I was told to lightly coat them with Ultra gray . The machine shop that has been building sprint car motors for the last 30 years wont assemble without it . I have done this the last 2 time with no problems .

[RAIV55]

Originally Posted by 65nss4spdGTO

I will add one more note, keep the gasket with the original head, I also would not re-use the gasket if the head was re-surfaced while the gaskets were off.

I've reused them but only with the same heads on the same block and had no issues. Changing heads or block with used gaskets may work but something I wouldn't care to try.

[charlie66]

I have reused them with out coating them and never had a problem... If it makes you feel better then just coat them. Either way you will be fine...

[68blackbird]

Any body reused Cometics going from E heads to iron?

Is there a way to tell how thick the gasket is? They are new to me. Came of a motor that had never been fired.

Rich

[Hillard]

I've used and re-used Cometics switching blocks & heads and never coated them. Never had a problem either. Usually these are anywhere from 11:1 - 13:1 compression, n/a motors.