For horsepower hotter than Carroll's famous Texas chili, Shelby's 427 FE single plane intake delivers racetrack power in a 2000-7500 and higher rmp range. This aluminum manifold is ideal for drag or road racing or any maximum horsepower application where hood clearance isn't an issue. Carburetor mounting pad is square bore configuration. This manifold fits Shelby FE Aluminum heads and factory 390/406/427/428 cast iron FE heads.