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First clean the intake and decarbonize the valves and chambers. This is critical.

Now, install a flow-matched set of injectors.

Next, drill the exhaust manifolds and install O2 bungs and sensors to measure the O2 from each sensor.

Plug the sensors into your balancing computer and warm up the engine fully. Then run it on the dyno and look at the graph from the computer.

Utilizing the info from the graph, select a set of injectors that will complement the application's characteristics and install them in the appropriate positions.

Dyno the car again to verify that it's properly balanced.

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Q: How do you tune the fuel injection on a Z24 engine?
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