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Holley has designed a set of fuel injection kits to support the installation of the advanced Holley EFI on Chevrolet engines as well as other engines equipped with an intake manifold that will accept a Holley 2300, square bore, spead bore, or dominator carburetor. These kits are assembled to be as complete as practical for the given application. At one end of the spectrum, the Avenger TBI Kits include absolutely everything you need for the installation, right down to the fuel pump. The Avenger and HP Multi-Point and Stealth Ram kits even include the intake manifold for specific vehicles.
If you have an engine that is already carbureted and want to switch to fuel injection, a TBI system may be your best choice, particularly if you currently have an engine with a Holley 2-barrel or Holley 4-barrel carburetor. For the countless millions of engines who have these carburetors (or any brand carburetor with a matching base) then one of the Holley EFI 2-bbl or 4-bbl TBI systems are ideal. These kits include a TBI throttle body that will bolt directly in place of your carburetor for an easy install. TBI throttle bodies are different from standard air-door type throttle bodies in that they have injectors built right into the throttle body.
Throttle body injection is a thing of beauty in its simplicity, but there is no question that multi-point fuel injection (where fuel is injected right into the intake runners, hence the name "multi-point injection") is a much more efficient means of deliverying fuel. Holley offers multi-point fuel injection kits for Chevy applications that are only a bit more challenging to install than the TBI kits, and offer tremendous performance improvements. Simply remove the existing intake manifold and replace it with the kits' fully assembled multi-point fuel injection manifold. It includes fuel pressure regulator, throttle body, and more.
The Holley Stealth-Ram fuel injection kits offer the same completeness and convenience as the multi-point kits, but instead of a single-plane intake and 4-bbl carburetor-style throttle body, these offer the incredible good looks of the Holley Stealth Ram intake and throttle body.
Want MPFI but don't have a Chevy app? Holley didn't leave you out entirely. Their Universal Retrofit Fuel Injection Kits are designed to allow the builder to create a multi-point fuel injection system out of an existing V8 Intake Manifold with Holley 4150 or 4500 carburetor. These kits include a throttle body that matches the Holley 4150/4500 carburetor footprint but includes the fuel rail and other components necessary for a multi-point fuel injection kit. Some machining is required on the intake manifold so it will accept the fuel injectors, but this is a relatively straight-forward process for your machine shop.
And if you already have fuel injection and want to simply upgrade to Holley Fuel Injection, the Holley ECU/Harness Fuel Injection Kits are exactly what you are looking for. These fuel injection kits include those components of their stock fuel injection system so they can use the full extent of the Holley HP System's ECU with many of their original components. Finally, for those applications where the is no other Holley Fuel Injection Kit available, ECU/Harness kits are available that allow virtually any piston-style internal combustion engine up to 10 cylinders to be the benefactor of the amazing technology avialable through Holley EFI by allowing the builder to source his or her own intake manifold, fuel rails, injectors, and other fuel injection components.
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