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I tried your search feature and had no luck, so I thought I'd post here. Is the small block V15 available with a threaded non SG crank?? If so, what is the part number? While I've got your attention on this engine, I've got a question about carb venturi's. How do you know which venturi to use for which application. I would think the larger venturi the more top end and less bottom end and vice versa. I'm on a 265ft dirt oval and need somewhat of a full range of power, but I would prefer from mid to high, so would I use the alrger venturi?