This manifold can be used on any Chevy V-8 engine utilizing the 1996 and later Vortec (Gen 1+) cast iron heads or the Edelbrock E-Tec aluminum heads. This manifold has provision for external water bypass. It also features four corner water outlets, dual distributor hold-downs, includes a square bore carb adapter and gasket, and will work with a late model style water neck, alternator, HEI and air conditioning brackets. Will also fit 1996 and later Vortec engines with some minor modifications. The modification is not to the manifold itself. It just requires running a short section of heater hose from the pipe tapped hole in the front of the manifold to the 5/8 inch hose nipple on passenger's side of the water pump.