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6.4 Aftermarket
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[QUOTE="Black AOD, post: 1419451, member: 16536"] That's O-Ringing you just described. Fire ringing is described as below: Fire ringing is cutting or machining a circular groove in your cylinder head OR block surface, or sometimes both surfaces. The groove is generally machined in the head in most street uses. Once the groove is cut, a circular mild steel ring is set on the block in the grooves that were cut. In the case of having the head cut, generally you glue the rings to the head to ensure proper positioning with the cylinder when you install the cylinder head. allowing a strong seal. This application will hold upwards of 100PSI of boost when using the correct fasteners. When you machine both the head and block, about half the recommended machining depth is used on the head and block, this way, the rings are set in both the head and the block with even less chance of them shifting when re-installing the head. [/QUOTE]
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