You should be able to tell by the sound which sounds horrible to the normal 'tune' she plays
Quote:
Originally Posted by Despise
a gasket should always be used anyway, as machined parts are never 100% flat
(why do you think you run gaskets between machined engine parts - bore, head, engine covers etc....)
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I would have though that is more to do with the internal pressure and the fact that metal to metal wont create a tight seal, even if perfectly straight. A gasket fits in tightly between the 2 surfaces thus creating a perfect seal.