My best guess would be if you had a 6cyl OMC to think about a 17" or even a 19" if light loaded. If you got a few big assed buddies a 15" would be necessary.
But being you got a 4cyl the biggest I'd plan for would be a 17" if real light loaded. A 15" might be close to what you need if you got a usual load.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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