Based on our 80mm LS1 throttle body #3867, the Victor LS series 90mm racing throttle body is designed to increase flow and horsepower potential in competition applications. The lower water tube has been removed, but it retains the stock LS1 style TPS, IAC and PCV port. Extra idle control is provided with the addition of an idle bleed screw. It has both an LS1 and LS2 intake manifold flange and can be mounted on aftermarket LS1 manifolds with a 90mm opening, or LS2 and LS7 factory manifolds, but does not retain all stock equipment or throttle cable setup. It is perfect for enthusiasts who want to use an LS2 or LS7 manifoldor entire engine in an older vehicle with no fly-by-wire throttle. Edelbrock Victor LS Series Throttle Body 3864 90mm - Racing - GM III/IV LS Engines90mm SizeDesigned For Modified Gen III/IV EnginesIncreased Flow And HorsepowerFor High Performance Street Or CompetitionExtra Idle Control Is ProvidedPit Stop USAoffers Edelbrock Victor LS Series Throttle Body 3864 at low everyday prices. Be sure to check out all of the products from Edelbrock including Edelbrock Fuel System and Intake Parts and Accessories, Edelbrock Fuel Injection, Edelbrock Throttle Bodies.