I was talking to a friend who has a 21' crown line cuddy with a 5.7 liter ( I don't know the HP). He wants to put on a bigger prop to get more speed but he doesn't know what his max rpm's should be for that engine. Any help would be appreciated.


Thanks, SOX

typically, the 5.7 max power is rated at 4400-4800
so best to prop for 4800 when loaded lightly

Thanks, I give him my friend a call before he blows up his engine!!!