1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 20Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 20

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GENERAL INFORMATION
CAUTION
If propeller is installed that does not allow engine rpm to reach the specified full-throttle rpm range, the engine will "labor" and will not produce full power