EFI Conversion Kits

Does your engine cough on cold starts, or does the carburettor need adjusting again and again? A conversion kit replaces the carburettor with electronic fuel injection, typically with intake, injectors and ECU combined in one system. This category is for you if you want to upgrade the fuel delivery in a classic project.

What an EFI conversion kit does

The kits in this category use sequential port injection, where each cylinder gets fuel from its own injector and an ECU meters the amount according to the engine's needs. This can give more stable cold starts, idle and throttle response, but the result depends on the engine, setup and tuning. You will find e.g. Edelbrock Pro-Flo 4 and Pro-Flo 4 XT.

How to choose the right kit

• Engine type: The kits are made for specific engines, e.g. Ford 351W, Chrysler RB 413-440 and Gen II HEMI. Check the engine code precisely.
• Cylinder head and block: Some variants specify e.g. rectangular intake ports and standard deck height, so compare with your own parts.
• Power target: Product data states e.g. 625 hp max. and 35 lb/hr injectors. If your target is higher, you should consider other fuel injectors and the rest of the fuel system.
• Finish: Several kits are available in satin or black.

Installation and maintenance

A conversion typically also requires a pump, filter and lines that can deliver the pressure the injection system needs. Check what the specific kit includes; additional fuel rails and injector seals can be found under fuel injection. Replace leaking O-rings on the injectors, and keep the fuel filter clean so the injectors don't clog.

Frequently asked questions

Can I keep my current fuel pump when converting?

Often not. Fuel injection typically requires a higher and more stable fuel pressure than a carburettor. Check the kit's requirements for pump, filter and any return line before you install it.

Can I run more than 625 hp with the kit?

625 hp is the maximum stated in the product data with 35 lb/hr injectors. If you want to go higher, it depends on injectors, pump and engine management, and the entire fuel system must be assessed for your project.

Does the car need an inspection after an EFI conversion?

It depends on the product and the car. Check the approval and documentation for the specific part number, and confirm with your inspection authority whether the modification requires inspection or registration before the car is driven on the road.