Description: This manifold has oval ports instead of rectangular ports. It features four corner water ports, dual distributor hold- downs and nitrous bosses. This is a proven design that produces outstanding torque and horsepower when used in the right engine combination. Best on en- gines with displacement in the 396 to 454 range producing from 600 to 700 horsepower. Specifications: Cylinder Head Type: Oval Port Engine Make/Size: Chevy Big Block (396-454) RPM Range:3000~7500 Package Contects: 1* Intake manifold UPC Does not apply Brand Deepmotor Manufacturer Part Number DM-3716 Material Aluminum Type Big Block Chevy .