1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 355Get this manual
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HOLLEY MODEL 41606407 and 6576 CARBURETORS DESCRIPTION HoUc Mod1 4160, 6407 and 6576 arc 4- venturi downdraIt carhur orsThe fJrimary suppli es fucl -air mi xture througho ut the cntir rang of ralionan