C387 boats have had two types of Yanmar engines — 3JH3xx and 3JH4xx. Note that the 3JH3 engine has a much higher engine RPM to reach max horsepower. Note also that this means that the transmission will also be different. The change to 3JH4 engines took place around hull #60. The following is the specification for the 3JH3 engine:
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