The Edelbrock #38640 Victor LS Series 90mm Throttle Body is Designed for modified Gen III-IV engines in high-performance's street or competition applications. Throttle body #38640 DOES NOT Include a TPS or IAC Motor. Extra idle control is provided with the addition of an idle bleed screw. They have an LS1/LS2 flange that can be mounted on aftermarket LS1 manifolds with a 90mm opening as well as LS2/LS7 factory manifolds. They do not retain the lower water tube and are perfect for enthusiasts who want to use an LS2 or LS7 in an older vehicle with no fly-by-wire throttle.