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These Cyclone intake manifolds from Professional Products are designed to fit engine swaps using the 1996 and later Vortec cast iron heads or the Edelbrock E-Tec aluminum heads. These manifolds can be used on any Chevy V8 engine utilizing the late Vortec head. They have a provision for an external water bypass. These Cyclone Vortec intake manifolds feature 4-corner water outlets, dual distributor hold-downs, a square bore carb adapter and gasket, and will work with late model style water neck, alternator, HEI, and air conditioning brackets.