[Tiara Open] 1989 3100 Open Propeller Size

[Ship Happens]

Hello All

Just wondering if you can tell me the correct propeller size for a 1989 3100 open with 8.2l detroit Diesels 300hp.
At the moment they have 18x21 3 blade, but think we are suffering from cavitation!

[GMT16750]

Hello All

Just wondering if you can tell me the correct propeller size for a 1989 3100 open with 8.2l detroit Diesels 300hp.
At the moment they have 18x21 3 blade, but think we are suffering from cavitation!

Best source of info will be a Prop Shop or the local Detroit Diesel dealer.