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Message: [QUOTE="strokin'_tatsch, post: 113597, member: 7"] O ring is a groove cut in head and install a metal "o ring" that will press on top of the stock fire ring that comes in the head gasket. The fire ring being the metal ring in the head gasket that seals around the cylinders Fire rings use a deeper groove in the head or block and instead of relying on the stock fire ring in a head gasket being further squeezed by an oring, you completely cut the fire ring out of the gasket. The fire ring you install is he only seal you have, eliminating the weaker fire ring in the head gasket, allowing for higher boost numbers and more heat without blowing. [/QUOTE]

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