Designed for 1987-95 305/350ci (5.0/5.7L) Chevy Throttle Body Injectioned (T.B.I.) engines. Ideal for trucks, Blazers and Suburbans (Will not fit Caprice or Buick and Cadillac "B" Bodies). For 305 and 350 V8s with OEM T.B.I. 1987-95. T.B.I. water jacket similar to stock. Accepts all OEM equipment and small-bore (1-11/16') throttle body injectors only. No chip changes or computer mods required unless entire 5.7L Power Package (manifold, cam, heads) is used. Computer chip is supplied free of charge with proof of purchase of manifold, cam and heads. The chip re-programs your computer for optimum power gains when the entire package is installed. This Total Power Package greatly improves performance.