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Center the distribution block on the underside of the intake manifold. Usually the block will sit directly on the outside of the heat-riser passageway. The bottom row of fittings on the block will be used for nitrous, and the top row will be used for fuel. Begin by installing the nitrous lines, starting first with the closest (shortest and hardest to bend) line. Thread on the first steel tube and tighten it finger-tight.