Available for Small Block and Big Block Chevy (9.8" deck height) engines, as well as 289-302 (8.2" deck height) and 351W (9.5" deck height1) Ford engines, the FAST™ XFI™ Single Plane Intake Manifolds are designed to produce tremendous horsepower and high rpm torque from 3500-7500 rpm (Big Block Chevy), 4500-8500 rpm (Small Block Chevy, 351W Ford) and 4500-9000 rpm (289/302 Ford). All manifolds are designed to accept square bore, four-barrel 4150-style throttle bodies, such as the FAST™ Part #307603, and feature a fuel injector boss in each runner that will accept any of the high performance injectors offered by FAST™. The matching lightweight aluminum FAST™ fuel rails for the manifolds feature a large internal diameter for outstanding fuel pulse dampening and flow characteristics.