6.2L rpm range
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Location: Eaton Rapids, Mi , USA
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rpm
I would go to a larger prop and turn it at 5k. The peak hp for these engines is at or around 5k. I think it is actually at 4900 but 5000 has to be close. I would suspect that if you turn a 21 at 5000 you will gain some speed. Ck the prop calculator. Dwight