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Re: 2.3L vs 2.4L
There is some wrong info in this thread.
The 4G63 bore is 85mm, while the 4G64 bore is 86.5mm, not 87mm.
The rod ratio of the 2.3l is not better than the 2.4l, it is the same. They use the same rod length and same stroke. The 2.3l just uses a condensed piston.
You should actually be able to run a 2.4l block on a stock car. The stock DSM air metering system is not based on volumetric efficiency, like a Honda or speed density car. It uses a MAS, which measures actual airflow into the motor. The MAS would read more airflow for the bigger displacement and the ECU would add more fuel on it's own.
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