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    300/440/550 Tapered nozzle boring on a 550sx question??????????

    How much should I bore my nozzle on a 91 550sx w/ reed motor? I've never done this. I'm gonna send it to Zero soon and need to give him a number. Also, I'm sending him my flywheel and was asked if I want the ring gear drilled? Do I want this done? Any info would be great? Thanks......
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