Product details:

Professional Products, Cyclone Intake, Chev SB, Polish (idle-5500) Designed for Street, RV, Street Strip and oval track applications. Use a stock Quadra-Jet or square flange carb (with included adapter plate). These dual plane 180 degree manifolds have features other similar brands don't, including dual distributor hold-downs, and four comer water ports. Each manifold is pressure checked before packaging.