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 than does the 3JH4. 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 3JH4 engine:
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