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Continuing our theoretical build, we turned our attention to the induction side because extra cubic inches are worthless if you can't efficiently ventilate them. Brian showed us a pair of stock 318 heads, and the ports are laughably small and convoluted. That's not surprising, however. There was never a performance version of the 318, so don't expect any factory 318 heads to show stellar flow numbers, except for maybe the Magnum versions.