How to Switch a 460 Carb Engine to a 460 Fuel Injected Engine


Fuel injection produces better gas mileage and lower emissions than a carburetor. Fuel injection delivers the fuel/air mixture to the combustion chambers in the exact amount and at the proper time for efficient engine operation. Switching over is a delicate and exacting job but it can be accomplished provided the mechanic has a good set of shop tools and the training to know how to do it.

Things You'll Need

  • Standard shop tools
  • Fuel line disconnecter
  • Wheel chocks

Remove, Install and Adjust

  • Separate the fuel line from the carburetor. Drain the water from the engine, and then take off the upper water hose and the distributor. Remove the entire carburetor and intake manifold assembly.

  • Inspect the surfaces of the head and the top of the engine block. Clean off any dirt, grease or old gasket material. Clean the ports and lifter valley. Install the intake gaskets. Be careful to keep foreign material out of the intake ports. Inserting a rag or towel in the lifter valley will keep the engine free from dirt and grime.

  • Apply silicone sealer to the front and rear gaskets. It is important to overlap the corners of the side gaskets to prevent oil leaks.

  • Install the multi-point injection unit. Take care to make it as square as possible before lowering it onto the gasket. It helps to remove the fuel rails.

  • Bolt on the intake manifold. Treat the threads of the outer bolts with anti-seize compound, and then coat the four inner bolts with anti-seize/sealant compound (because they protrude into the head).

  • Tighten the bolts finger tight, and then torque them in cycles, going from side to side. Start in the middle and move outward. Torque the bolts to the foot-pounds of force indicated in the instructions that came with the fuel injection kit.

  • Replace the fuel rails. Install the tubes that connect the fuel rails. Coat the O-rings with light oil. Take special care when inserting the injectors into the intake manifold. You should be able to install them without undue force. Hook up the vacuum line that controls the fuel pressure regulator.

  • Hook up the throttle and kickdown linkage.

  • Connect the idle air control, the intake air temperature sensor and the manifold absolute pressure sensor. Connect the water temperature sensor, coating it with thread sealer.

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  • Photo Credit engine image by goce risteski from
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