head gaskets oem or cometic
#2
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I would only run the cometics in a application where the block surface and the head surface are "new". If anything is more than .001" out, you could get a leak. I had hell with them in my brand new application, but it dosen't seem that all have the same problem. I may have had a surface that was mis-decked. If you do use Cometics, be sure and spray them with a light coat of copper gasket adhesive. You can get it at any auto parts store. It's made by permatex.
#3
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ive had my cometics off twice now on a 22k mile block that previously had graphite gaskets on it (not a perfect surface) and they sealed fine both times. I havent inroduced any extreme cylinder pressures (n2o or blower) but i have reved the motor to 7k.
Dave
Dave