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By PWH42 - 17 Years Ago Does anyone remember what size jets would have originally been in a 4 barrel Holley on a 57 Bird? By 55Birdman - 17 Years Ago fordomatic  55 primary 48 secondary, straight drive . Carb # 87A-9510P manual and auto primary 45 secondary 55. this is with 312 ECJ engine. By PWH42 - 17 Years Ago Thanks, That tells me what I needed to know.