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I am gonna take a shot at this and am sure I will be corrected.
stage 1 = intake, exhaust, and fuel management.
stage 2 = stage 1 + cams
stage 3 = stage 2 + big bore kit
stage 4 = stage 3 + head work.
I know a lot of people dont include the big bore kit as a stage and say they have a stage 2 big bore which would be the kit + cams and then stage 3 wold be the head work. Hope this helps and correct me if I am wrong guys.
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