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Case Boring Recommendations

    All cylinders that have 96mm or larger spigot holes, require that the case seating area be surfaced about 0.060" to provide a full seating area for the cylinder to set on, the same thickness all the way around the cylinder base. Subject to this is thick wall 90.5, 92, and 94 cylinders. This must be done in a milling machine, jig bore, Rotler case center, etc. It cannot be done with our GB 700 tool. If not done, it is possible to start having leaks at the base, especially later in the life of the case. Note: Please, be clear that the wording ‘thick wall’ is an expression of the industry and is not reflective of actual cylinder thickness, ONLY the size it is machined on the head and case ends.

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