Specifications: Cast Aluminum Intake Manifold Carbureted or Throttle Body EFI Dual Plane RPM Range: 1,500-6,500 4150 Square Bore Carb Base (Accepts Up To 1.75'' Dia. Throttle Bores) 3/8'' NPT Vacuum Port 1/8'' NPT MAP Sensor Port Rectangular Ports Designed To Fit Cathedral Port Heads Port Dimensions: 2.72'' x 1.00'' Intake Height: 6.15'' Front, 5.07'' Rear (Valley Cover to Carb Base Flange) Package including: .