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Why are you taking the motor apart at all? My plan for the Miata will be to leave the motor alone for at least the first year. The way I see it, in a year or two, I might actually need that extra 3 hp that a shop-built motor can yield. Before that, however, I would just be putting mid-pack mileage on a front-running motor - not a good way to spend you money.
My bet is the w-2-w seat time would be more valuable than a a new motor. Besides, what class will you be running in and will you be allowed to tinker? J-stock?
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